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    Hng dn s dng phn mm thit k mch in t Orcad 10.5 Li ni u

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    Phn mm thit k mch in t OrCAD ca tp on Cadence c cc chuynvin nh gi l mt trong nhng phn mm thit k mch mnh nht hin nay. OrCAD c mt v h tr cho cc k thut vin thit k mch t rt sm. T OrCAD phin bn3.2 chy trn nn dos cho ti phin bn 4.0 c nhng cp nht ng k. Tip l

    phin bn 7.0 chy trn nn window lm say m ngi thit k mch in chuynnghip, sau c phin bn 9.0, 10.5 v mi nht hin nay l phin bn 15.7.

    Orcad l mt phn mm chuyn dng rt mnh vi giao din rt thn thin, cchs dng n gin. Bn c th v mch nguyn l vi OrCAD Capture, chy m phng

    vi Pspice, c bit l chc nng v mch in rt mnh vi OrCAD layout, cng vi mtth vin linh kin khng l c hu ht cc nh sn xut linh kin in t cung cp choOrCAD. C l chng ta khng cn phi bn ti sc mnh ca n m phi quan tm tivic lm sao khai thc v s dng OrCAD hiu qu trong vic thit k mch.

    Vi mc ch hng dn s dng v gip cc bn thun li hn trong vic thit kmch, nhm chng ti xy dng nn ti liu Hng dn s dng OrCAD 10.5 ny.Chng ti ngh rng ti liu ny kt hp vi s thc hnh, my m nhiu ca cc bn sgip cho cc bn thc hin hiu qu v nhanh chng hn vic thit k mch khi s dng

    phn mm OrCAD.Vi s n lc ht mnh ca cc thnh vin trong nhm, chng ti c gng trnh

    by tht r rng v chi tit nhng cng khng th trnh khi nhng thiu st. Mong thyc v cc bn gp ti liu ca chng ti c hon chnh hn.

    Nhm 1 04T1

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    Chng 1: V mch nguyn l bng ORCAD CAPTURE1.1. Tng quan v Orcad Capture1.2. V mt mch nguyn l bng Orcad Capture1.2.1. Khi ng Capture1.2.2. To mt project mi1.2.2.1. Ca s Capture CIS1.2.2.2. To mt new project1.2.2.3. Thit lp kch thc cho bn v1.2.2.4. Mt s cng c hay dng trong vic v mch nguyn l

    1.2.3. V s nguyn l1.2.3.1. Tm kim v chn linh kin1.2.3.2. t linh kin1.2.3.3. Sp xp linh kin1.2.3.4. Chy dy v hiu chnh linh kin1.2.4. Kim tra li s nguyn l1.2.5. To netlist1.3. To linh kin mi t ca s Capture1.3.1. Gii thiu1.3.2. Cc bc to linh kin mi

    1.3.2.1. Tm datasheet1.3.2.2. Phn tch datasheet1.3.2.3. Khi ng capture1.3.2.4. To th vin cha linh kin1.3.2.5. Bt u to linh kin1.3.2.5.1. To tng nhm chn linh kin1.3.2.5.2. Chnh sa v v ng bao1.3.2.5.3. Lu

    Chng 2: V mch in bng ORCAD LAYOUT PLUS

    2.1. Gii thiu tng quan v phn mm Orcad layout 10.5:2.2. Ni dung2.2.1. Khi ng Layout plus2.2.2. Mt s menu lnh c bn2.2.2.1. File2.2.2.1.1. Open2.2.2.1.2. Import2.2.2.1.2. Export

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    2.2.2.2. Tools2.2.2.2.1. Library Manager2.2.2.2.2. OrCAD Capture2.2.3. To project mi2.2.3.1. Lin kt Footprint

    2.2.3.1.1. Mt s footprint thng dng2.2.3.1.2. Lin kt footprint2.2.4. t footprint trn board mch2.2.4.1. Chnh sa chn linh kin2.2.4.2. To mi chn linh kin2.2.4.3. Nhng ch khi to mi chn linh kin2.2.5. Mt s thao tc cn thit trc khi Layout2.2.6. Thit lp mi trng thit k

    2.2.6.1. Thit lp n v o v hin th2.2.6.2. o kch thc board mch

    2.2.6.3. nh ngha Layer Stack2.2.6.4. Thit lp khong cch gia cc ng mch2.2.6.5. Thit lp rng ng mch in2.2.6.6. V Board Outline2.2.7. Sp xp linh kin ln board mch2.2.7.1. Sp xp linh kin bng tay2.2.7.2. Sp xp linh kin t ng2.2.8. V mch2.2.8.1. V t ng2.2.8.2. V bng tay

    2.2.9. Hon thin bn mch2.2.9.1. Chn mt on text vo mch in2.2.9.2. Ph ng cho mch in2.2.9.3. Kim tra li2.2.10. In mch Layout

    Chng 3: M phng mch bng ORCAD PSPISE3.1. Gii thiu Orcad Pspice3.1.1. Chc nng ca Pspice3.1.2. u im ca Pspice vi mt s phn mm m phng thng dng3.2. L thuyt3.2.1. Cc cng c h tr cho vic m phng3.2.1.1. Orcad Capture3.2.1.2. Simulus Editor3.2.1.3. Model Editor3.2.2. M phng3.2.2.1. M phng t ca s CAPTURE3.2.2.3. M phng s dng ca s Pspice hoc Pspice A/D

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    3.2.2.3.1. Cc bc thc hin3.2.2.3.2. Xc nh li loi phn tch t mt file m phng c sn3.2.3. Cc dng phn tch c bn3.2.3.1. Phn tch DC Sweep3.2.3.1.1. Thit lp m phng DC sweep

    3.2.3.1.2. Phn tch bin th cp3.2.3.1.3. V h c tuyn vi phn tch DC Sweep3.2.3.2. Phn tch Bias point3.2.3.2.1. Hm truyn tn hiu nh DC3.2.3.2.2. Phn tch nhy DC3.2.3.3. Phn tch AC Sweep/Noise2.2.3.3.1. Phn tch AC Sweep3.2.3.3.2. Phn tch nhiu (noise)3.2.3.4. Phn tch Transient v Fourier3.2.3.4.1. Phn tch Time domain (Transient)

    3.2.3.4.2. Phn tch Fourier3.2.4. Cc dng phn tch nng cao gm nhiu phn tch cng lc3.2.4.1. Parametric v Temparature3.2.4.1.1. Phn tch Parametric (tham s)3.2.4.1.2. Phn tch nhit 3.2.4.2. Monte Carlo v Sensitivity/worst-case3.2.4.2.1. Phn tch Monte Carlo3.2.4.2.2. Phn tch Worst case3.2.5. M phng s3.3. V d

    3.3.1. V d m phng mt s mch tng t3.3.1.1. M phng mt mch theo phn tch DC3.3.1.1.1. DC Sweep3.3.1.1.2. DC Sweep/ secondary sweep3.3.1.1.3. H c tuyn v ng ti3.3.1.2. M phng mt mch theo phn tch bias point (im phn cc)3.3.1.2.1. Phn tch Bias point3.3.1.3. M phng mt mch theo phn tch AC/Noise3.3.1.3.1. Phn tch AC Sweep3.3.1.3.2. Phn tch nhiu AC/Noise3.3.1.4. M phng mt mch theo phn tch trong min thi gian3.3.1.5. Phn tch Monte Carlo v Sensitivity/worst case (phn tch nhy)3.3.1.5.1. Phn tch Monte Carlo3.3.1.5.2. Phn tch Sensitivity/worst case3.3.1.6. Phn tch Parametric v nhit 3.3.1.6.1. Phn tch Parametric3.3.1.6.2. Phn tch nhit 3.3.2. M phng mt mch s

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    1.1. Tng quan v Orcad CaptureOrcad Capture l phn mm dng v mch nguyn l, phn mm ny rt thun tincho vic tm v chn linh kin v mch nguyn l v th vin ca n cung cp kh y linh kin.

    1.2. V mt mch nguyn l bng Orcad Capture1.2.1. Khi ng CaptureKhi ng Orcad vi chng trnh Capture hoc Capture CIS.

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    1.2.2. To mt project mi1.2.2.1. Ca s Capture CIS

    Mn hnh CaptureCIS hin ra nh trn . Tip theo bn to mt project mi lm vic.

    1.2.2.2. To mt new project to mt project bn c th lm nh sau:

    y Chn menu file >> new >> project.

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    y Hoc chn nt lnh create documenty Hp thoi new project hin ra, nhp tn project, chn ng dn cho project.

    y Xut hin mt ca s , cho php bn chn v tr t project (Location) v tnproject (Name).

    y Bn c th nhp vo nt Browse chn ng dn cho project.

    y Ca s tip theo cho php bn chn th mc lm vic.y Nu bn mun to mt th mc con cha cc project ca bn, nhp vo nt

    CreateDir

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    y Trong hp thoi Create Directory, bn nh tn th mc mnh mun to v bmOK.

    y Sau khi to v chn th mc con, bn c th t tn cho project. Ti ngh tt nhtbn nn chn tn project v tn th mc con trng nhau tin cho vic theo di.

    1.2.2.3. Thit lp kch thc cho bn vSau khi to project lm vic, xut hin mt ca s c cc chm nh.Tip theo bn chn kch thc cho bn v, bn c th thay i sau nhng theo ti bn nn

    chn trc.y Trong tab Options chn Schematic Page Properties nh sau:

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    y Mt hp thoi Schematic Page Properties hin ra cho php bn chn kh giynh sau:

    y Bn c th chn kch thc theo Inches hoc Milimeters. Bn c th chn khgiy mc nh theo A4,A3,A2,A1,A0 hoc chn theo Custom tu bn, ri bmOK.

    1.2.2.4. Mt s cng c hay dng trong vic v mch nguyn lMt s cng c hay dng trong vic v mch nguyn l vi bn schematic.Dng biu tng trn thanh Tool palette (hoc dng phm tt).

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    : Tm linh kin (P).: Nt chn.

    : Chy dy (W).: To net (N).

    : To im ni (J): .

    : Ngun (F).

    : t (G):

    : im khng ni (X).Xoay linh kin (R).Lt linh kin theo trc ngang (H).Lt linh kin theo trc dc (V).

    1.2.3. V s nguyn l1.2.3.1. Tm kim v chn linh kin tm linh kin bn c th lm nh sau:

    y Nhn P

    y Chn biu tng

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    y Nu l ln u tin bn chy ORCAD th th vin linh kin cha c ADD vo.Do bn chn ADD Library a cc th vin thm vo.

    y Trong hp thoi Browse File nh trong hnh sau, bn c th ADD cc linh kinvo, bn chn tt c cc file.olb v nhn open.

    y Sau khi add th vin, bn s thy hp thoi nh sau:

    y T hp Libraries , cc bn ch chut vo bt k mt trong cc th vin c Addvo th danh sch cc linh kin trn ca s Part List s thay i.

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    y Thng bn khng th no nh linh kin no thuc th vin no c, do bnnn chn ht (bm Ctrl+A). Bn s thy hnh sau:

    y Bn nh tn linh kin vo hp Part chn linh kin ph hp vi mch nguynl.

    y Cc bn nhp OKv ca s ny mt i, linh kin dnh vo chut ca bn.y Khi bn nhp chut tri th linh kin c t xung nh hnh v.

    y Mc d linh kin c t xung giy v vn tip tc dnh vo chut, nu bnnhp tri tip th n tip tc c t .Do ngng vic t linh kin nhn

    phm ESC trn bn phm.

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    y Bn nn t y linh kin vo kh giy trc ri ni mch li.y ni mch cc bn nhp vo ch Z ngc gc phi pha trn ca s lm vic.

    y Bn bm chut tri vo chn linh kin ny v ni vo chn linh kin khc.y Bn cng c th ni dy t chn linh kin vo dy c sn hoc gia cc linh kin

    vi nhau.y Mun di chuyn linh kin nhp vo linh kin v ko n ni cn.y Bn cng c th xoay linh kin Rotate, lt theo trc dc Vertical, lt theo trc

    ngang Horizontal.y Cui cng l cc chn ca linh kin no khng ni th nh du X vo.

    qu trnh hng dn n gin, ti s hng dn thng qua mt mch c th.

    Mch ti chn l mch nguyn l: Mch iu khin sng n.

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    y Bn thy rng mch ny gm c: 1 cu diode, 3 jack cm 2 chn, 1 t phn cc,1 diode zener, 6 in tr, 1 quang tr, 1 bin tr, 4 transistor, 1 triac , 2 chnmass.

    y u tin bn to kh giy v ly tng linh kin ra.y V d khi ly in tr:

    Bm P

    Bm OK.

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    1.2.3.2. t linh kin

    y Bn ln lt ly cc linh kin cn li. Sau khi ly ht tt c cc linh kin bn s chnh sau:

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    1.2.3.3. Sp xp linh kiny By gi bn sp xp cc linh kin theo s mch.

    1.2.3.4. Chy dy v hiu chnh linh kiny Chng ta thay i gi tr cho ph hpy V d i vi R3

    Nhp double clickvo gi tr linh kin.Nhp gi tr vo v nhn OK. (theo di hnh bn)

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    y Thc hin ln lt i vi cc linh kin khc. Sau khi xong ta c hnh sau:

    1.2.4. Kim tra li s nguyn ly Nhp biu tng minimize trn gc phi ,mn hnh sau xut hin v chn page1.

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    y Nhp biu tng design rules checky Hp thoi design rules check, nhp okv khng thng bo g th bm OK. Nu

    c thng bo li bn hy sa li ri tip tc.

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    1.2.5. To netlistPhn ny ti s hng dn cc bn to netlist t c th chuyn sang v mchin.u tin bn to file.mnl.

    y Nhp vo biu tng c ch create netlist. Mt hp thoai Create Nestlist hin ra,in y thng tin vo hp thoi ri bm OK.

    y Ti y bn s thy mt hp thoi khc hin ra cng l c tn l Create Nestlist.

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    y Chn layout. Bm OK.

    T y bn c th v mch bng Orcad Layout Plus.

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    1.3. To linh kin mi t ca s Capture1.3.1. Gii thiuVic to ra linh kin mi trong capture rt quan trng, bi v cc chn linh kin in tu sn xut theo mt s tiu chun nht nh.

    Trong layout th mt s chn linh kin ta khng bit, bn cng c th tm mt linh kinkhc m c chn tng t, cn trong capture th cng vic bn khng th thc hinc.

    1.3.2. Cc bc to linh kin miMt project c th bao gm trong vic to ra linh kin mi, to ra bn v hoc xutmch in.

    Nh vy vic to ra linh kin mi c th l mt phn trong khi bn v mt bn schematicno . Khi vic to ra linh kin mi l vic lm ph phc v cho bn schematicno .

    to ra linh kin mi, bn cn phi nhn din linh kin l g, tc l bit datasheetca n.

    Gi s bn cn to linh kin l mt con IC 74LS138.

    1.3.2.1. Tm datasheetVic u tin l bn phi i tm datasheet ca 74LS1238 lm c iu ny bn cth ln http://www.google.com. Ri g tm 74LS1238.Sau khi tm bn s c c mt bn datasheet nh sau:

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    1.3.2.2. Phn tch datasheetKhi c datasheet trong tay, bn xem th chn linh kin ca n b tr ra sao.

    Vic tip theo l hnh dung cch b tr chn trong schematis.y Nhm chn A B C l nhm chn u vo chn v bt u t chn s 1, cc chn

    ny u mc cao.y Nhm chn G1 (mc cao), G2A v G2B(mc thp) l nhm chn u vo iu

    khin, bt u t chn s 4.y Chn VCC chn s 16 v chn GND chn s 8.y Nhm chn ng ra Y0Y7 , chn Y7 v tr chn s 7 cn cc chn cn li

    Y0(15).Y6(9).Sau khi phn tch v tm hiu v tr cc chn chng ta bt u i thit k.

    1.3.2.3. Khi ng captureBn khi ng Orcad Capture nh hng dn phn 1.2. Bn s c ca s Capturenh sau:

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    1.3.2.4. To th vin cha linh kinTrc ht bn cn phi to ra mt th vin cha cclinh kin mnh to ra, bn chn tab file >> new >>library. Mt khung thoi Add to Project nh sau hin ra:

    Sau khi hp thoi hin ra, y l lc Capture hi bn mun to ra th vin u. To ratrong ch trong project hay to ra trong Library.

    y Nu cc bn to ra ch trong project ang thc hin th chnC:\ORCAD\ORCAD_10.5......

    y Nu to ra mt linh kin mi b sung vo Library th chn New Project.

    Ti chn New Project v bm OK. Mt ca s khc hin ra:

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    Khi ny th vin c to ra v nm trong c s qun l.

    Cc bn s thy mt th mc Library c to ra,trong c mt file Library.olb.

    Nhp chut phi vo v chn New Part chun b to ra linh kin mi.

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    1.3.2.5. Bt u to linh kin

    in tn linh kin vo v y l con chip c th nh ngha kiu n l UKhi cc bn bm OK, t ca s Capture bn s thy mt ng bao ngoi vi nt t.Kiu linh kin c ghi pha trn l U?; Gi tri linh kin c ghi pha di l.

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    Nh cc bn bit to ra linh kin l to ra cc chn linh kin , ri to ra hnh dngng bao v t tn cho ph hp.

    1.3.2.5.1. To tng nhm chn linh kin

    Chng ta to ra 3 chn A B C.y Starting Name l A, starting number 1, number ofpins l 3, shape l ng v

    chn linh kin thng l lin tc nn chn l line, type l loi nhm chn chnInput.

    y Increment l tng Starting Name v Starting number ln, y n v tng lnl 1.

    y Pin Space cc chn t st nhau nn chn l 1.

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    Khi cc bn OKth con chut ca bn bin thnh 3 chn linh kin.Trn khi U vung,cc bn t n cnh no n s cnh .

    Nu nh s chn linh kin to ra di hn khi U vung th khi ny t ko di ra.Tip theo l 3 chn u vo iu khin , cch lm tng t nh sau.

    y i vi chn G2A ti chn G2C:

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    y Tip theo l chn Y7

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    y Chn mass(GND) Chn mass l chn ngun nn ta chon kiu Power Chn ny c hai ch hin th v khng hin th,ta chn hin th ra.

    Check vo PinVisible.

    N s hin ra nh sau

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    y Cc chn Y0Y6

    y Cui cng l chn cui cng l chn Vcc

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    1.3.2.5.2. Chnh sa v v ng baou tin, bn kch vo biu tng hnh vung thanh tool palette v ng bao.Bn double click vo chn linh kin chnh sa cho hp vi s chn.

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    1.3.2.5.3. LuSau khi ta hon thnh.Chng ta Save v xem li trong mn hnh qun l.

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    2.1. Gii thiu tng quan v phn mm Orcad layout 10.5:Orcad layout l mt phn mm rt mnh chuyn dng v s mch in t s mchin nguyn l c v bng Orcad capture (hay bng cc phn mm v mch nguyn lchuyn dng khc).Phn mm ny c lp trnh rt thun tin cho ngi s dng trong vic sp t linhkin, i dy v chun b s mch in cho vic sn xut

    2.2.Ni dung2.2.1. Khi ng Layout plus m Layout, vo Start Menu>>Program>>Orcad 10.5 >>Layout Plus

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    S xut hin hp thoi sau:

    2.2.2. Mt s menu lnh c bn2.2.2.1. FileCha cc lnh lin quan n vic to mi, m, nhp vo hay xut ra cc tp tin i tngvo Layout hay sang cc thnh phn khc(ca phn mm thit k mch khc nh Protel,PCAD PCB )

    2.2.2.1.1. OpenThanh Open lit k tt c cc tp tin.MAX ang nm trong th mc hin hnh. mfile .MAX bn ch cn chn file cn m sau chn Open l xong hay bn c th nhpdouble click chut vo file chn.

    2.2.2.1.2. ImportCho php m hay du nhp mt file c to ra t cc phn mm thit kmch khc nh Protel PCB, CadStar

    PCB

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    2.2.2.1.2. Export

    Cho php xut file .MAX c to rat OrCAD Layout sang cc phn mmthit k mch in khc nh CadStar PCB,

    Protel PCB

    2.2.2.2.Tools

    2.2.2.2.1. Library Manager

    Cho php bn edit hay to mi mt footprint camt linh kin no . T y bn c th to haysu tp mt th vin footprint linh kin m bn hays dng cho cc thit k sau ny ca mnh.

    2.2.2.2.2. OrCAD CaptureCho php bn m chng trnh thit k mch nguyn l OrCAD Capture t chng trnhv board mch OrCAD Layout.

    Ngoi ra trong Tools cn cc chc nng khc nh SmartRout cho php bn v mchthng minh, Edit App Settings, Reload App Settings.

    2.2.3. To project mi to project mi, vo menu File >> New. Bn s thy mt hp thoi hin ra nh hnhv sau:

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    y Ti khung Input Layout TCH ta nhp vo file template c t C:\OrCAD\OrCAD_10.5\tools\layout_plus\data\_default.tch. File template l file nh dng mt s thng s mc nh cho board mch,

    nh l s lp board mch, khong cch i dy, kch thc ng mch, quynh thit k, v...vc s dng xuyn sut trong qu trnh layout.

    Nu bn thit k board mch bnh thng th bn loaddefault.tch. Cn nubn mun thit k board mch ring theo mt hnh dng c th, nh Soundcard,Lan card, th load cc file template khc.

    y Ti khung Input MNL nestlist file bn nhp vo file nestlist c ui l MNL (c to ra trong Orcad Capture).

    y Ti khung Output Layout Max file bn nhp vo ng dn v tn file m bnmun file thit k ca mnh c lu. Layout Plus s mc nh tn file output

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    layout trng tn vi file input nestlist. Nu bn thay i file output th khngc thay i phn m rng (.max).

    y Sau clickApply ECO. ECO (Engineering Change Order): l mt lnh caLayout cho php s thay i ca mt trong hai s Layout hay Capture cng sdn n s thay i tng ng ca s kia.

    Nu cc linh kin trong mch thit k l cc linh kin mi, v cha tng lin kt n thvin footprint ca Layout ln no, th n yu cu bn phi lin kt n footprint. y l

    bc kh khn i hi bn phi cn thn. Bn s tin hnh cch lm ny phn bn di.Kinh nghim cho thy s tt hn nu bn thc hin vic gn footprint cho tt c cc linhkin trong sut qu trnh v mch bng Capture.

    2.2.3.1. Lin kt Footprint lm tt phn ny th i hi bn phi thng xuyn lm mch, c kinh nghim snhanh tm c cc footprint trong th vin.

    2.2.3.1.1. Mt s footprint thng dngy Th vin TO: TO92(trans.C828,C1815,C535,)TO202 (trans. H1061, IC n p

    h 78xxx, 79xxx )y Th vin DIP100T: /W.300 (cc IC cm t 14-20 chn) /W.600(cc IC cm t 24-

    40 chn )y Th vin TM_CAP_P l footprint ca cc loi t in.y Th vin TM_CYLND l footprint ca cc loi t in.y Th vin JUMPER l footprint ca cc loi in tr, quang tr,bin tr

    (JUMPER100,JUMPER200,JUMPER300,)y Th vin TM_DIODE l footprint ca cc loi diode hay Led.

    2.2.3.1.2. Lin kt footprintSau mt thi gian ch i, hp thoi nh sau xut hin.

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    Trong hp thoi Link Footprint to Component c thng bo l khng th tm thy chnmch in ca C1 c tn l:CAP_POL.V th nn tm chn cho linh kin ny bng cchnhp chut vo nt Link existing footprint to component

    y Hp thoi Footprint for CAPACITOR_POL xut hin ti khung Libraries

    nhp chn mc JUMPER.

    y Ti khung Footprints nhp chn mc JUMPER200 (khong cch chn l 200mils bng 5 mm) chn chn mch in cho T.

    y Chn xong bm Ok.

    Tip theo trong hp thoi Link Footprint to Component c thng bo l khng th tmthy chn mch in ca R8 c tn l R. Nhp vo nt Link existing footprint tocomponent

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    y Hp thoi Footprint for Rxut hin,ti khung Libraries nhp chn mcJUMPER.y Ti khung Footprints nhp chn mc JUMPER200 chn chn mch in cho

    in tr ny.y Bm Ok.

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    Trong hp thoi Link Footprint to Component c thng bo l khng th tm thy chnmch in ca J1 c tn l CON2. Nhp vo nt Link existing footprint to component

    y Hp thoi Footprint for CON2 xut hin, ti khung Libraries nhp chn mcJUMPER.

    y Ti khung Footprints nhp chn mc JUMPER100 chn chn mch in choCON2.

    y Nhp Ok.

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    Trong hp thoi Link Footprint to Component c thng bo l khng th tm thy chnmch in ca Q1 c tn l T2323. Nhp vo nt Link existing footprint to component

    y Hp thoi Footprint for T2323 xut hin, ti khung Libraries nhp chn mcTO.

    y Ti khung Footprints nhp chn mc TO126 chn chn mch in cho Triac.y Nhp Ok.

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    Trong hp thoi Link Footprint to Component c thng bo l khng th tm thy chnmch in ca Q2 c tn l 2N3904. Nhp vo nt Link existing footprint tocomponent

    y Hp thoi Footprint for 2N3904 xut hin,ti khung Libraries nhp chn mcTO.

    y Ti khung Footprints nhp chn mc TO202AB chn chn mch in choTransistor.

    y Nhp Ok.

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    Trong hp thoi Link Footprint to Component c thng bo l khng th tm thy chnmch in ca D1 c tn l RB152. Nhp vo nt Link existing footprint to component

    y Hp thoi Footprint for RB152 xut hin,ti khung Libraries nhp chn mcBCON100T.

    y Ti khung Footprints nhp chn mc BLKCON.100/VH/TM1SQ/W.100/4 chn chn mch in cho cu diode.

    y Nhp Ok.

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    Trong hp thoi Link Footprint to Component c thng bo l khng th tm thy chnmch in ca D2 c tn l DIODE_ZENER. Nhp vo nt Link existing footprint tocomponent

    y Hp thoi Footprint for DIODE_ZENERxut hin, ti khung Libraries nhpchn mc JUMPER.

    y Ti khung Footprints nhp chn mc JUMPER100 chn chn mch in choDIODE_ZENER.

    y Nhp Ok

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    Trong hp thoi Link Footprint to Component c thng bo l khng th tm thy chnmch in ca R1 c tn l R2. Nhp vo nt Link existing footprint to component

    y Hp thoi Footprint for R2 xut hin, ti khung Libraries nhp chn mcJUMPER.

    y Ti khung Footprints nhp chn mc JUMPER200 chn chn mch in choquang tr.

    y Nhp Ok.

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    Trong hp thoi Link Footprint to Component c thng bo l khng th tm thy chnmch in ca R2 c tn l RESISTOR_VAR_2. Nhp vo nt Link existing footprint tocomponent

    y Hp thoi Footprint for RESISTOR_VAR_2 xut hin, ti khung Librariesnhp chn mc JUMPER.

    y Ti khung Footprints nhp chn mc JUMPER300 chn chn mch in chobin tr.

    y Nhp Ok.

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    Sau khi thc hin xong cc bc trn xut hin hp thoi:

    Nhp chn Accept this ECO.Tip theo nhp OK.

    Sau khi lin kt cc footprint n ton b cc loi linh kin, Orcad t ng load ccfootprint nh hnh v :

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    2.2.4.t footprint trn board mchKhi cc footprint c load, nu khng ng vi yu cu thit k thc t th bn phichnh sa hoc to mi chn linh kin cho ph hp.

    2.2.4.1.Chnh sa chn linh kinChn footprint linh kin cn thay i trn board mch va load, sau click chut phiv bn s thy menu dc xut hin, tip theo bn chn Properties.

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    Sau khi chn Properties th mt hp thoi xut hin cho chng ta chn loi footprintthch hp.

    Click chut vo Footprint, sau bn s thy mt hp thoi cho bn chn footprint thchhp.T hp thoi Select Footprint ta c th lachn footprint thch hp theo ca mnh.Tuy nhin, nu cc footprint c trong SelectFootprint khng ph hp th chng ta

    phi to mi footprint cho ph hp v

    kch thc ca linh kin.

    2.2.4.2. To mi chn linh kinTa c th t to linh kin mi bng cch m Layout ln, vo menu Tools Librarymanager

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    to mt footprint mi hon ton bn bm Create New Footprint V d:To footprint cho mt pushbutton (Panasonic part EVQ-PAG04M) bn cn mt sthng tin v kch thc ca n:

    hp thoi Create New Footprinty Nhp tn linh kin mi mc

    Name offootprint, v d l PBy Bm chn English. Mc d

    kch c cc b phn ca linhkin c cho h mt nhnghu ht kch thc ch to PCBvn bng n v inches ( haymils = 1/1000 inch).

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    y dng theo h mt bn phithay i systems settings. (voOptions >>System Settings) xuthin hp thoi bn.

    y Nhp OK. By gi bn ang lm

    vic theo h mt.

    Switch c tt c 4 chn nhng ta ch cn nh dng cho 1 padstack v cc chn du c c

    im ging nhau.y u tin vo View Spreadsheet ->Padstacks. Ta thy xut hin hp thoi

    padstacks, ta double click vo padstack c tn T1 s xut hin hp thoi EditPadstackcho tt c cc lp ca T1.

    y Bn thay i tn ca padstack ny, thngth t tn theo tn footprint. iu ny lmcho vic tm kim n d dng hntrongLayout khi c nhiu padstack. Tip nhp

    chn Undefined trong mc Pad Shapey Nhp OK. Xut hin hp thoi padstacks.

    Bn thy padstack tn PB vi tt c cc lpca n khng c nh dng

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    Da vo Datasheet bn nh dng cho cc lp ca padstack PB. Nu chn nhiu lp cngmt lc th nhn chn tn cc lp ng thi gi phm Ctrl. Bn ch cn nh dng chonhng lp cn thit .

    y u tin bn cn nh dng kch thc cho chn l khoan, theo datasheet ngknh chn l khoan l 1 mm.

    y Ta chn 2 lp DRLDWG, DRILL.y Click phi chut chn Properties , xut hin hp thoi Edit Padstack >> nhp

    chn Round, sau nhp gi tr 1(=40 mils) vo Height v Width.y Nhp OK

    Bn thy trong hp thoi padstacks lp DRLDWG, DRILL c nh dng:

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    Tng t bn nh dng cho cc lp TOP, BOTTOM, INNER. Thng th kch thcca vng xuyn bao quanh l chn khoan ln hn l khoan khong 20 mils(=0.5 mm).Do nhp gi tr 1.5mm vo Height v Width.V lp gia ca mch l ming ng dnh cho power v ground, trnh hin tngngn mch ngi ta thng to ra xung quanh cc l khoan mt khong trng, ln hn

    kch thc l khoan l 35 mils(=1.75 mm). Bn nhp gi tr 2 mm vo Height v Widthv chn pad dng round cho lp PLANE.Cui cng bn cn nh dng cho mt hn chn linh kin, thng th n ln hn vngxuyn bao quanh chn l khoan khong 5 mils(=0.125 mm). Do bn chn pad hnhround v nhp gi tr 1.625mm vo Height v Width cho lp SMTOP and SMBOT.

    Sau khi nh dng xong cho cc lp ca padstack ny, ta s lu tn ca footprint mi tovo th vin, ta nn to th vin mi d dng tm kim sau ny.

    y Bng cch clickSave As trong hp thoi Library manager.y in tn footprint mi to, sau click vo Create New Library to th vin

    mi.

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    y Nhp OK th footprint mi to s c lu vo th vin.

    Sau chn Text tool xa bt cc ch khng cn thit i, ch li &Comp v&Value. Nhp vo text cn xa v bm phm Delete (trn bn phm).Thm cc chn linh kin vo bng cch chn cng c b.

    y Click chut phi vo nn en, chn Newy t chn mi v tr thch hp

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    Chn thuc tnh cho 2 text cn li bng ko chut bi n, xong click chut phi, chnProperties (phm tt Ctrl+E).

    y Chn Layer l SSTOP.y Chn OK.

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    Sau bn sp xp li v tr cho cc chn, bn lun lun t v tr ca pad1 ti(x,y) = (0, 0) >> double click vo pad1 xut hin hp thoi EDIT PAD.

    y Bn da vo Datasheet bit khong cch gia cc chn xc nh v tr cho ccchn cn li. Pad2 = (0, 6.5)

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    y Cc chn khc tng t

    Pad4 = (4.5, 0) Pad3 = (6.5, 4.5)

    y Bn c th dng cc cng c o dt nh: Dimension, Measurement trong menu

    Tool c th to khong cch chnh xc gia cc chn.y Ngoi ra bn cn c th v thm cc ng bao (Obstacle) cho linh kin, y lng ranh gii gia cc footprint khi sp xp chng khng b chng chonhau.

    y v ng bao bn click vo biu tng Obstacle Tool, sau click phi chutchn New, gi chut tri ng thi ko n cc gc chn pad, ng bao baoquanh cc chn pad.

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    y u tin bn t tn cho ng bao, sau chn Place Outline ti ObstacleType. dy width ty .

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    Thng bn chn ng bao ny nm lp Global Layer, tc thuc tnh ObstacleLayer l Global Layer.Cui cng clickOK lu li cc nh dng cho footprint mi to.Bn hon thnh vic to 1 footprint mi khng c sn trong th vin ca layout. nhanh hn bn c th lt qua th vin ca layout tm nhng footprint tng t

    footprint m bn cn to sa cha cho ph hp vi thc t ri Save As n li, lu litrong th vin mi m bn to cho d tm kim.

    2.2.4.3. Nhng ch khi to mi chn linh kinKhi thit k footprint, ngoi vic bn cn bit chnh xc kch thc thc gia cc chnlinh kin thit k k ng, cn phi bit kch thc ca c linh kin c th b trkhong cch gia cc linh kin cho hp l.Mt s kinh nghim chn kch thc cho chn linh kin:

    y Vi cc linh kin thng nh in tr, t, diode bn chn chn hnh trn(Round), ng knh l 1.8 n 2.1, ty loi linh kin.

    y Chn 1 ca IC hay cc linh kin c cc tnh nh t hoc diode bn nn chn kiuchn l hnh vung hoc hnh ch nht.

    y Vi IC ta nn chn chn hnh Oval (vi cc chn 2 tr ln) v hnh ch nht (ivi chn 1). Kch thc thng l 1.7mm Width v 2.2 mm Height.

    y Vi cc chn linh kin to nh chn ca cc JACK cm, chn ca IC c cn thnn chn b Width(b ngang) to ra mt t, c 1.8mm.

    y Thc t vic to ra linh kin trong Capture quan trng hn rt nhiu ln sovi vic to ra linh kin trong Layout (hay Layout Plus).

    Bi v cc linh kin in t u c sn xut theo mt s tiu chun nht nh, v cckiu chn ca linh kin c nh chun. Do bn ch cn s dng cc chn layout

    c nh dng ging vy s dng, khng nht thit phi to ra cc nh dng chn chotng linh kin ring bit.

    2.2.5. Mt s thao tc cn thit trc khi LayoutTrc khi i vo cc thao tc chnh khi layout, bn cn lm mt vi vic nh gip mnhnh hin thi d nhn hn.

    y u tin, bn s tt DRC (Design Rule Check), bn s cn dng chng sau,nhng khng phi by gi. Sau khi tt, khung ch nht nt t s bin mt.

    y Nhng k hiu xut hin bn cnh cc linh kin c th khng cn thit nhngchng s lm cho mn hnh ca chng ta ri hn. C 2 cch xa chng i:

    Chn Text Tool trn thanh cng c, click chut vo on k hiu m bnmun xa i, sau click chut phi v chn delete. Hoc nu bn mun xa hon ton cc k hiu i km, bn lm nh sau:

    Chn lp 23 AST nh hnh v, sau tt n i.(s dng phm -)

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    Sau mn hnh s xut hin nh sau:

    2.2.6. Thit lp mi trng thit k

    2.2.6.1. Thit lp n v o v hin thy cng l n v th hin rng ca ng mch in trong board mch. Mc ch cavn ny l gip cho ngi thit k qun l c kch thc ca cc nets trong boardmch cng nh kch thc ca board outline.Cch lm nh sau: Vo Options >> System settings. Bn s thy hp thoi sau xuthin:

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    y bn nn chn n v l Millimeters(mm). Ngoi ra ta cn c th thit lp li v,t li nu cn thit khung Grids.

    2.2.6.2. o kch thc board mchVo Tool >> Dimension >> Select Tool.Sau o di v rng ca ng bao. Mc ch ca cch lm ny l cho ngithit k bit c board mch mnh thit k c kch thc tht bao nhiu, t cnhng iu chnh hp l trong vic sp xp cc linh kin trong ng bao cho ph hp

    vi board mch in m mnh ang c.

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    2.2.6.3. nh ngha Layer Stack nh ngha Layer Stack,bn chn Spreedsheet t Toolbar

    Nhp Layers chn lp v, y bn chn lp BOTTOM, click chut phi chn

    Properties.

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    Chn nh sau:

    Nhp chn OK.

    2.2.6.4. Thit lp khong cch gia cc ng mch thit lp nhng lut v khong cch cho pads, tracks v vias. Bn chn Spreedsheett Toolbar. Chn Strategy >> Route Spacing.

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    T menu pop up chn Properties, bn s thy:

    y bn c th iu chnh cc thng s cho ph hp. Cn ch n v o m bn thit lp trn.Chn OK.

    2.2.6.5. Thit lp rng ng mch inBn lm iu ny iu chnh rng ca cc nets trong mch khc nhau ty theo chc

    nng ca chng.V d nh: cc ng ngun, mass phi ln hn cc ngun tn hiu, hay cc ng ngvi mch cng sut th b rng cng phi ln hn bnh thngMun iu chnh cc thng s ny bn c th lm nh sau: Vo Spreedsheet Nets.Bi en tt c:

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    Kch chut phi chn Properties:

    Min Width, Conn Width, Max Width l rng ca nets mch in. Khng nn 3 gitr ny bng nhau, v khi i mch my s t ng iu chnh rng ca nets. Khi t tth n chn Min, khi nhiu s chn Max, nh vy s linh hot hn.

    2.2.6.6. V Board OutlineBoard Outline l ng bao ngoi cho tt c cc linh kin v cc ng mch trongmch in. v bn tin hnh nh sau:

    y Click chut vo Obstacle Tool, sau click vo mt gc m bn mun vOutline, con chut chuyn thnh du cng nh, click phi, chn Properties shin ra hp thoi sau:

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    y Bn chn nh hnh v. Sau chn OK.y Click vo 4 gc ca khung m bn mun v, sau nhn ESC.

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    2.2.7. Sp xp linh kin ln board mchVic b tr linh kin ln board mch l mt trong nhng yu t quan trng quyt nh n n nh, d v v thm m,v.vca board mch.Bn c th sp xp linh kin bng tay hoc s dng chc nng t ng sp xp ca

    Layout Plus.

    2.2.7.1. Sp xp linh kin bng tayNhp chut vo biu tng Component Tool trn thanh cng c. di chuyn linh kin no ta nhp chut vo linh kin , sau , khi nh chut ra v dichuyn th linh kin cng s di chuyn theo. n v tr cn t linh kin th nhp chutmt ln na, v linh kin s c c inh.Sau khi sp xp mt lc ta c nh sau:

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    2.2.7.2. Sp xp linh kin t ngu tin bn cn phi c nh mt s linh kin m bn mun n c t mt v tr xcnh, trnh b thay i v tr trong qu trnh auto.Di chuyn linh kin n v tr xc nh, nhp chut phi chn Lock.

    Sau khi c nh c cc linh kin theo yu cu, chn Auto >> Place >>B

    oard.2.2.8. V mchLayout Plus h tr c 2 chc nng v t ng v v bng tay. Thng thng nn kt hpc 2 chc nng ny, v khi v t ng i khi s c nhng ng mch rt phc tp, lc ta nn iu chnh li bng tay.

    2.2.8.1. V t ngVo Auto >> Auto Route >> Board, Layout Plus s t ng v mch.

    2.2.8.2.V bng tayChn Edit Segment Mode.

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    Kch vo dy mun v, lc dy s gn vi con tr, r chut to ng mch, kchtri chut c nh ng mch. i hng ng i ca mch: kch vo cui on dy, sau i theo hng m bnmun v.Sau khi v xong, nhn ESC kt thc.

    Nhp F5 refresh bn mch.Sau khi v, bn s c nh sau:

    2.2.9. Hon thin bn mchn y, bn hon thnh mch in v mt c bn. Trong phn ny bn s tin hnh mts thao tc cui cng trc khi xut mch in.

    2.2.9.1. Chn mt on text vo mch in

    Chn Text Tool t thanh cng c. Click phi vo mnhnh chn New.Hp thoi Text Edit hin ra, trong khung Text String g ni dung cn chn.Lu : nu bn lm mch in th cng th click chn Mirrored khi i khng b ngc.

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    Chn OK.Di chuyn on text n v tr cn chn, click chut.

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    2.2.9.2. Ph ng cho mch inMc ch ca vn ny l chng nhiu cho mch in.Cch lm nh sau:

    y Chn Obstacle Tool. Nhp chut vo khung mch,con chut co thnh du cng nh th click phi, chn Property.

    y Mn hnh s xut hin hp thoi Edit Obstacle.

    y Trong khung Obstacle Type chn: Copper Pour.y Trong khung Obstacle Layer chn lp cn ph Copper Pour: c th l TOP hayBOTTOM.

    y Trong khung Net Attachment th chn l GND hoc POWER, ty theo bnmun ph theo GND hay POWER.

    y Nhn OK.

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    2.2.9.3. Kim tra liSau khi v xong bn cn kim tra li s ng n ca mch in bng cch click chutvo DRC trn thanh cng c.

    Nu mch c li hoc cnh bo (bng nhng vng trn mu ) th bn phi sa ht cc

    li th mch in th thit k mi khng m bo b chm nhau.

    2.2.10. In mch Layout in mch Layout va v, bn thc hin cc bcsau:

    y Chn Option >> Post Process Settings

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    y Nhp chut phi vo lp mun in (vd: lp BOTTOM), chn Preview

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    y Vo menu File, chn Print/Plot

    y Chn nh trn, nhp chn OK.

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    Kt qu bn t c l:

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    3.1. Gii thiu Orcad Pspice3.1.1. Chc nng ca PspiceOrcad l mt chng trnh ng dng gm y cc cng c cho mt ngi thit kmch. Ngoi cng c v mch nguyn l, v mch in, Orcad bao gm c chng trnhm phng kh mnh, c bit n vi tn Orcad Pspice.Pspice l mt chng trnh m phng hot ng ca mt mch in t. iu ny cho

    php bn c th kim tra kh nng hot ng ca mt mch va thit k trc khi tinhnh v mch in v lm vic vi cc linh kin tht.

    Pspice c th m phng mch tng t, mch s hoc mch hn hp c cc linh kintng t v s. y l mt trong nhng u im quan trng ca Pspice.Bn c th m phng mt mch t chnh ca s Capture hoc Capture CIS, hoc cng cth m phng t cc ca s ca Pspice.Sau khi tin hnh ci t Orcad, t thanh start, vo menu Orcad bn c th thy c rtnhiu mc u c ch Pspice. Mi mc ng vi mt ca s ring bit v mi ca s cho

    php bn lm vic vi cc dng m phng khc nhau.

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    Nu bn chn mc Pspice bn ch c th m phng mt mch tng t, nhng nu chnmc Pspice A/D bn c th m phng mch tng t, mch s, hoc mch hn hp gmcc linh kin tng t v s. Pspice A/D c thit k gm cc vng lp hi tip songsong bn c th m phng mt mch hn hp gm c linh kin s v tng t mtcch ring l.

    Bn cnh Pspice v Pspice A/D, b cng c Orcad cng bao gm mt s cng c thmvo quan st kh nng hot ng v nh gi tin cy ca bn thit k trc khichuyn i n thnh sn phm thc. V d nh Pspice smoke analysis cho php ngi sdng m phng mch theo phn tch smoke dng phn tch mch vi nhng iu kinnguy him nht (stress conditions) ca linh kin. Hoc Pspice Optimizer dng cnchnh cc s liu trong bn thit k sao cho ph hp vi iu kin thc t, gip ngithit k quan st xem mch va thit k c t c cc mc tiu hot ng m h t rahay khng.

    Ngoi ra cn c cc cng c nng cao cho cc cng c va k trn, dng cho mc chrng hn khi thit k mch st vi thc t v yu cu nhiu linh kin hn.

    Orcad c a ra vi 2 bn chnh thc, bao gm bn full dnh cho mc ch thng miv bn lite dnh cho sinh vin, c cung cp min ph. Nu s dng bn Lite th rt tlinh kin, v vic m phng s gp nhiu kh khn, ngoi ra trong bn thit k cng giihn s lng linh kin, rt kh thit k cc mch ln. Do trong ti liu ny trnh

    by cch m phng s dng bn Orcad full. Pspice ch cho php m phng trong slng cc linh kin c sn trong th vin cung cp km theo sn phm. Vic to linh kinmi tuy thc hin c nhng rt phc tp, do s khng trnh by k trong ti liu ny.Tuy nhin, th vin ca Pspice rt ln, cho php ngi thit k c th m phng ln n16.000 linh kin tng t v 1.600 linh kin s, do vi ngi s dng hon ton c thyn tm s dng Pspice m phng hu ht cc loi mch thng thng.

    Trong ni dung ti liu ny, do thi gian c hn v kinh nghim s dng Orcad Pspicecha nhiu nn ch gii thiu mt s chc nng c bn ca Orcad Pspice. Nhng chcnng nng cao v phn tch thc t (Smoke hay Optimizer) cha th nghin cu r rngnn khng a vo ti liu ny.

    3.1.2. u im ca Pspice vi mt s phn mm m phng thng dngPspice l phn mm mnh v m phng tng t, phn tch dng sng. Mc d th vinlinh kin ca Pspice kh ln nhng thiu nhng linh kin hin th trc quan nn rt khquan st mch s. Tuy nhin phn phn tch mch tng t ca Pspice th kh y , thvin linh kin nhiu v cho nhiu dng phn tch p ng yu cu thc t nn c th sdng hiu qu trong vic thit k mch thc t.Hin nay, phn mm m phng kh ni ting l Proteus. y l phn mm mnh v m

    phng vi iu khin. Orcad Pspice th khng m phng c vi iu khin. Tuy nhin vth vin linh kin th Orcad Pspice nhiu hn v v th kh nng m phng cng t hiuqu hn, nht l i vi dng mch tng t.Phn mm Protel cng c phn m phng tng t nh Orcad Pspice, v cng c th lyth vin linh kin t Orcad sang nn kh nng m phng cng tng i mnh. Tuynhin dng phn tch ca Protel th khng a dng bng.

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    3.2. L thuyt3.2.1. Cc cng c h tr cho vic m phng3.2.1.1. Orcad Capturey l cng c chun b bn v cho vic m phng.Trong ca s ca Orcad Capture ngi s dng c th lm nhng cng vic sau phc

    v cho vic m phng:y To mt project mi.y V mch.y Thit lp thng s cho cc linh kin trong mch.y Thit lp dng sng u vo.y Thit lp ch v cc tham s m phng.y Chn im m phng.

    3.2.1.2. Simulus Editory l cng c nh dng dng sng u vo ca mch, cng c ny cho php ngi

    s dng t nh dng dng tn hiu bin i theo thi gian c dng trong qu trnh mphng. chn cng c ny, bn lm nh sau:

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    Ca s ca cng c ny s xut hin, bn chn biu tng to mt dng sngmi:

    to dng sng bn chn biu tng , hp thoi sau s hin ra:

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    Bn g tn ca dng sng mi, v chn dng sng cn thit lp. Vi Stimulus Editor bnc th thit lp cc dng sng sau:

    y Cc dng sng tng t: sng sin, xung, sng theo hm m, sngPWL(piecewise linear), SFFM (single-frequency FM).

    y Vi dng sng s: xung ng h n gin, n cc tn hiu xung phc tp v

    chui bus.Sau khi chn dng sng, bn s thit lp thng scho dng sng mi, bm Ok, mt hp thoi khchin ra.

    Bn thit lp cc thng s cho dng sng mi, sau bm apply, bn s c dng sngmi. V d vi cc thng s nh sau s c dng sng mi to l:

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    Ring i vi dng sng tng t PWL v cc dng sng s, Stimulus Editor cho phpbn t v dng sng m khng cn hp thoi thit lp thng s, bng cch nhp chut vocc im ngay trn mn hnh hp thoi Stimulus Editor.

    3.2.1.3. Model Editor

    y l cng c gip ngi s dng np vo cc thng s ca linh kin phc v choqu trnh m phng, nhng linh kin ny phi c trong th vin ca Orcad Pspice hocOrcad Capture, ngi s dng ch thay i cc thng s ca linh kin, km theo lthay i cc c tuyn ca linh kin. Cc thng s np vo c th ly t datasheet calinh kin. chn cng c ny bn lm nh sau:

    T ca s ca Model editor bn chn biu tng chn linh kin, sau thay ithng s linh kin bng cch in cc thng s vo bng xut hin trong hp thoi:

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    C 2 cch thay i thng s linh kin, dng c tuyn v dng bng tham s:

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    Tng kt li, chun b cho vic m phng bn cn c cc cng c to ra mt s file dliu, c th tng kt nh hnh v:

    3.2.2. M phng3.2.2.1. M phng t ca s CAPTURE m phng mt mch hon ton mi, cha c lu trong Orcad 10.5, bn m ca sCapture:

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    y T ca s Capture, chn biu tng to mt project mi, hp thoi sauhin ra:

    Bn chn tn cho project, chn Analog or Mixed A/D nh dng file mphng (nu khng chn nh trn th file to ra s khng m phng c), ri bmOK. Mt hp thoi khc hin ra:

    Nu file m phng to mi hon ton khng km theo hay tha hng t mt filec sn no th bn chn Create a blank project ri bm OK. Nh vy bn tora mt file m phng mi.

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    y Sau khi v mch (phn v mch c hng dn trong chng 1), bn chn file

    >> save hoc bm Ctrl+S hoc chn biu tng lu mch va v, bnchn tab Pspice >> New simulation profile thit lp thng s cho qu trnhm phng, mt hp thoi nh sau hin ra:

    Bn nh tn ca file m phng sto, nu khng s dng file nhkm bn chn none nh hnh v, nus dng file nh km bn chn biu

    tng ri ch n ng dnn file nh km. Sau bn chnCreate to file m phng.

    Hp thoi sau s hin ra, y l hp thoi thit lp thng s cho qu trnh mphng:

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    y Chn dng m phng t tab Analysis. Nu l m phng s th chn tab Optionsri chn Gate-level simulation t hp Category nh hnh v:

    y Sau khi thit lp y thng s cho qu trnh m phng, chn dng m phng,

    bn bm OK, file hin thi ca bn l mt file m phng. (Vic chn dng mphng no, thit lp ra sao s trnh by trong tng loi m phng phn Cc dngm phng.)

    y Lc ny, bn c th sa cha mch ca mnh nhng sau phi thit lp li thngs cho file m phng nh trn.

    y Tip theo bn mPspice >> Marker v chn mt trong nhng loi cng c csn t vo im cn quan st khi m phng. Vic chn loi marker no tuthuc vo loi thng s (dng hay p ...) bn mun xem ca s Probe.

    y Sau khi t cc Marker, bn chn Run t tab Pspice hoc bm F11 bt u mphng. Nu khng c li g xut hin th bn s nhn c mt ca s Pspice hin

    th dng sng hoc cc thng s cn m phng.y Nu c li xy ra, bn c th xem li hin th ngay pha di khung ca s Pspice

    mi m:

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    y Lc ny bn c th sa li ri tip tc m phng nh trn.y Nu thnh cng bn s nhn c mt ca s Pspice c dng sng kiu nh sau:

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    3.2.2.3. M phng s dng ca s Pspice hoc Pspice A/D3.2.2.3.1. Cc bc thc hinTrong phn ny bn c th thc hin m phng t ca s Pspice vi mt file cha mch c v sn.

    y M ca s Pspice hoc Pspice A/D (nu bn mun m phng mt mch s hoc

    mt mch hn hp gm c linh kin s v tng t):

    y Trong ca s Pspice (hoc Pspice A/D) bn chn File >> New >> Simulationprofile to ra mt file m phng. Lc ny hp thoi sau s hin ra:

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    Bn nh tn file m phng s to vo Profile name, v nh tn file c chamch m bn cn m phng vo Inherit from an existing profile (y phi lmt file Pspice th mi thc hin m phng c), ri bm Create.

    y Hp thoai Simulation setting s hin ra, bn thit lp thng s m phng nh

    trong phn m phng t ca s Capture, ri bm OK.

    y Sau , bn chn Run t menu Simulation chy file m phng.

    3.2.2.3.2. Xc nh li loi phn tch t mt file m phng c snBn cng c th nh dng li file ang chy thc hin mt dng m phng khc, hocvi mt tham s m phng khc. T ca s Pspice bn thc hin cc thao tc nh trong

    phn 2.2.2.3.1. m file cn m phng. thit lp lai thng s cho vic m phng,bn chn Edit profile t menu Simulation. Hp thoi Simulation settings s hin cho

    php bn chn li dng m phng mong mun.

    Nh vy v c bn vic thit lp thng s cho cc loi m phng l nh nhau, ch khctrong phn thit lp thng s trong hp thoi Simulation settings. Do , t phn ny tri, khi thit lp loi m phng, ti ch nhc cc phn thit lp t hp thoi Simulationsettings m thi.

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    3.2.3. Cc dng phn tch c bnPspice c th thc hin c dng m phng tng t, m phng s v m phng hn hpgm c linh kin tng t v s. i vi mch s, Pspice ch h tr m phng linh kins theo dng phn tch Transient c bn, bao gm c dng phn tch worst-case (gm 2

    trng hp min-max). i vi mch hn hp th tt c cc dng phn tch di y uc thc hin.Pspice c th thc hin cc dng phn tch sau:

    y Phn tch DC, AC v transient: cc dng phn tch dp ng ca mch i vinhng u vo khc nhau.

    y Phn tch Monte Carlo, sensitivity, worst-case, v parametric: phn tch sthay i ca mch i vi cc gi tr khc nhau ca cc linh kin, thnh phntrong mch.

    y Phn tch Digital worst-case timing: dng phn tch nhng vn v thigian ch xy ra do s truyn tn hiu nhanh hoc chm.

    Cc loi phn tch ca Pspice:

    Loi phn tch La chn trong Analysis type Bin phn tchPhn tch DC

    im phn ccc tuyn truyn t tn hiu nh DC nhay DC

    p ng tn sNhiuPhn tch TrasientPhn tch FourierPhn tch tham s

    Nhit Monte Carlo nhy/ Trng hp khc nghit nht

    DC Sweep

    Bias pointBias pointBias point

    AC Sweep/NoiseAC Sweep/NoiseTime domain (Transient)Time domain (Transient)Parametric sweepTemperatureMonte Carlo/Worst-caseMonte Carlo/Worst-case

    Ngun (p hocdng)Tham s

    Nhit

    Tn s

    Tn sThi gianThi gian

    3.2.3.1. Phn tch DC SweepPhn tch DC phn tch hot ng ca mch ng vi trng hp mch s dng ngunmt chiu.Phn tch DC c c th thc hin cc phn tch sau:

    y DC sweep: Phn tch mt ngun, mt tham s hoc mt s thay i theo nhit ca mt mch c u vo l in p, dng in mt chiu.

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    y Bias point: Tnh ton im phn cc ca mt mch cho trc.y DC sensitivity: L mt phn trong kiu phn tch bias point, dng phn tch

    nhy ca in p tng hoc in p thnh phn.y Small-signal DC transfer: Cng l mt phn trong kiu phn tch Bias point,

    dng tnh ton li ca tn hiu nh DC, tr khng vo, tr khng ra.

    Cc iu kin thc hin phn tch DC:

    Loi bin phn tch Yu cuVoltage SourceCurrent SourceTemperatureModel ParameterGlobal Parameter

    Ngun p mt chiuNgun dng mt chiu

    Pspice A/D Model (.MODEL)Tham s tng c nh ngha trongParameter Block (.PARAM)

    thit lp cc loi phn tch DC ni chung, trong hp thoiSimulation settings chnDC Sweep trong hpAnalysis type.

    y Phn tch DC cho php bn phn tch mt ngun (ngun dng hoc ngun p),tham s tng hoc tham s m hnh, hoc nhit trong mt khong gi tr nhtnh. im phn cc ca mch c tnh ton i vi mi gi tr phn tch. iuny rt hu ch khi tm hm truyn t ca mt mch khuych i, ngng cao vngng thp ca cng logic

    y thit lp thng s mt chiu (ngun mt chiu, hoc dng mt chiu) th chn

    Properties t tab Edit, sau chn ct DC ri nh vo gi tr ca ngun:

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    y tnh ton thng s DC ca mt mch tng t, Pspice loi b nhng thng sc lin quan n thi gian ra khi mch. iu ny c thc hin bng cch hmch tt c cc t, ngn mch tt c cc cun cm, v ch s dng cc gi tr mtchiu ca ngun p v ngun dng. Tng t vi cc mch s, tt c cc tr truynu c thit lp bng 0, v cc ngun pht c a v gi tr ban u.

    3.2.3.1.1. Thit lp m phng DC sweep thit lp m phng DC sweep th phi dng nhng ngun c lp v thit lp mcin p hoc dng in 1 chiu cho mi ngun. Dng mt trong nhng thnh phn sau:

    i vi u vo l in pDng Khi thc hin...VDC

    VSRC

    Ch phn tch DC Sweep hoc phn tchBias point (hm truyn t)Phn tch nhiu thnh phn cng lc trong

    c phn tch DC Sweep hoc Bias point(hm truyn t)

    i vi u vo l dng inDng Khi thc hin ...IDC

    ISRC

    Ch phn tch DC Sweep hoc phn tchBias point (hm truyn t)Phn tch nhiu thnh phn cng lc trong c phn tch DC Sweep hoc Bias point

    (hm truyn t)

    Cch thit lp hon ton ging cch thit lp chung cho phn tch DC sweep:

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    3.2.3.1.2. Phn tch bin th cpPhn tch bin th cp c th c thit lp nh cc la chn trong phn phn tch DCsweep. Khi la chn phn tch thm mt bin th cp th mt vng phn tch na cthc hin. Tc l, vi mi s thay i ca bin th cp th bin s cp c kho st quatt c cc gi tr trong khong phn tch thm mt ln.

    thit lp loi phn tch ny bn lm nh sau:y Trong Options ca loi phn tch DC Sweep, nh du tick vo Secondary

    sweep .y in cc gi tr tham s cn thit v nh du vo cc la chn thch hp xc

    nh kiu phn tch mong mun.

    3.2.3.1.3. V h c tuyn vi phn tch DC SweepC th s dng phn tch DC Sweep vi la chn bin th cp v mt h c tuynca mt linh kin bn dn no , ng thi c th v ng ti ca mt in tr hoc

    ca chnh linh kin bng cch s dng Marker, thng dng markerCurrent into pint vo v tr tnh ton ng ti t in p c phn tch.

    3.2.3.2. Phn tch Bias pointi vi Pspice lc no im phn cc cng c tnh ton khi phn tch mc, bt k loi

    phn tch m bn chn. Tuy nhin nu khng chn phn tch Bias point th ch nhngim in p tng t v nhng im trng thi s c cho bit t file u ra (file phn

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    tch c to ra t PSpice hoc PSpice A/D). Nu kch hot loi phn tch Bias point tht file u ra ta c nhng thng s sau:

    y Danh sch tt c cc im in p tng t.y Danh sch tt c cc im trng thi s.y Dng in v cng sut ca tt c cc ngun in p.y Cc tham s tn hiu nh ca tt c cc linh kin.

    Tuy nhin ngay c khi kch hot phn tch Bias point bn vn c th b nhng thngs v im phn cc tng t v trng thi s trong file u ra bng cch chn thOptions trong hp thoi Simulation settings, chn Output file trong hp Category, ri

    b du tick trong Bias point node Voltage (NOBIAS):

    thit lp phn tch Bias point, bn c th lm nh sau:y Trong hp thoi Simulation settings, chn tab Analysis, chn Bias point trong

    Analysis type.y Trong hp Options, chn General settings (thng c nh du tick sn),

    in cc thng s cn thit vo cc mc v nh du chn cc thch hp cho yucu m phng ca bn.

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    y Sau bm OK lu thit lp va chn, ri bm Run tr menu Pspice chym phng.

    Ngoi vic phn tch Bias point c bn nh trn, trong mc Bias point cn c th thchin 2 loi m phng sau:

    3.2.3.2.1. Hm truyn tn hiu nh DCPhn tch ny tnh ton hm truyn tn hiu nh v cho bit li tn hiu nh, tr khng

    ra, tr khng vo.y thc hin phn tch ny th trong mch phi c t nht mt ngun u vo, v

    d nh VSRC.y Cch thit lp phn tch hm truyn tn hiu nh DC v tnh li tn hiu nh:

    Trong hp thoi Simulation settings, chn tab Analysis, chn Bias pointtrong Analysis type.

    Trong Options, chn General settings, tick vo chn Calculatesmall-signal DC gain (.TF).

    in tn ca ngun u vo vo From Input Source name. in gi tr cho in p ra hoc dng in ra thng qua mt ngun in p

    trong To Output variable.V d: nh V(a,b) ch nh bin u ra l in p gia 2 im a v btrong mch. Hoc nh I (VDRIV) ch bin u ra l mt dng inthng qua ngun p VDRIV.

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    Tt c cc tnh ton li t ngun u vo ti bin u ra u km theo tr khng vov tr khng ra.

    3.2.3.2.2. Phn tch nhy DC

    Phn tch nhy DC tc l phn tch nhy ca mt im in p (s thay i camt im in p) i vi tham s ca mt trong nhng linh kin sau:

    y in tr.y Ngun dng hoc ngun p c lp.y Chuyn mch iu khin bng dng hoc p.y Diode.y BJT.

    Thit lp phn tch nhy DC:y Trong hp thoi Simulation settings, chn tab Analysis, chn Bias point trong

    Analysis type.y Trong Options, chn General settings, tick chn Perform Sensitivity analysis

    (.SEN).y in cc thng s cn thit vo Output variable.

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    y Bm OK lu thit lp m phng va ci t.y Chn Run t menu Pspice hoc bm F11 chy m phng.

    3.2.3.3. Phn tch AC Sweep/Noise

    Phn tch ny tnh ton hot ng ca mch ng vi trng hp mch s dng 1 dngin thay i.Phn tch AC and Noise c th thc hin cc dng phn tch sau:

    y AC sweep: Phn tch p ng tn s ca mch tn hiu nh. u ra bao gmdng in v in p c v mt ln v pha. Ngoi ra cng c th dng cas v th bode trong thanh Probe quan st cc dng phn tch ny.

    y Noise: Cho bit p ng u ra khi c nhiu u vo, ng thi tng hpnhiu u ra khi c nhiu ngun nhiu u vo. ( phn tch nhiu th bn

    phi dng dng phn tch AC sweep)

    2.2.3.3.1. Phn tch AC SweepMt s iu cn lu trong phn tch AC Sweep:

    y Pspice phn tch p ng tn hiu nh ca mch i vi tng hp cc u vo bngcch tnh ton mch quanh im phn cc v coi mch nh mt mch tuyn tnh.Do , nhng linh kin phi tuyn, chuyn mch iu khin bng dng bng bngp, s c chuyn i sang mch tuyn tnh ti im phn cc ca n.

    y Linh kin s th gi nguyn trng thi khi Pspice tnh ton im phn cc.

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    y V phn tch AC Sweep ch thc hin phn tch tuyn tnh, nn n ch xt ti li v p ng pha ca mch, khng gii hn l dng in hay in p.

    y Cch tt nht thc hin phn tch AC Sweep l thit lp cho ln ca ngunbng 1, u ra o c bng chnh li, t thy c r mi tng quangia u ra v u vo.

    iu kin thc hin phn tch AC Sweep:y Phi s dng mt hoc nhiu ngun c lp.y Phi thit lp ln xoay chiu v pha cho mi ngun. Phn tch AC Sweep

    khng ging phn tch DC Sweep, y khng c ch thit lp ngun u vo,thay vo ngun c lp trong mch phi cha gi tr xoay chiu v c ln v

    pha.y Phi c mt trong nhng ngun sau trong mch:

    i vi u vo l in pDng Khi thc hin

    VACVSRC

    ch mnh phn tch AC Sweepnhiu phn tch cng lc trong c phntch AC Sweep

    i vi u vo l dng inDng Khi thc hinIACISRC

    ch mnh phn tch AC Sweepnhiu phn tch cng lc trong c phntch AC Sweep

    y Kch p 2 ln vo vo biu tng ngun m bng thng s, in vo gi trthch hp di cc ct. Tu vo loi ngun m ch nh gi tr xoay chiu ca ntheo mu sau:

    Vi ngun VAC hoc IACThit lp gi tr trong ct Gi trACMAG

    ACPHASE

    ln xoay chiu tnh bng Volts (i viin p) v Amps (i vi dng in)

    pha xoay chiu tnh bng

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    i vi ngun VSRC hoc ISRCThit lp gi tr trong ct Gi trAC -ln (Volts) hoc pha ()

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    Thit lp phn tch AC Sweep:y Chn tab Analysis trong khung hp thoi Simulation settings, trong hp Analysis

    type chn AC Sweep/Noise.y Trong hp Options, chn General settings (thng c chn sn).y Thit lp cc thng s theo mu sau:

    3.2.3.3.2. Phn tch nhiu (noise)Khi tin hnh phn tch Noise, Pspice s phn tch cho mi tn s c chn trc trong

    phn phn tch AC analysis/Noise i vi nhng loi nhiu sau:y Nhiu trong linh kin, bao gm nhiu c to ra u ra bi tt c cc in tr

    v linh kin bn dn trong mch. Nhiu trong cc linh kin bn dn s c chia rathnh cc nhiu thnh phn mt s v tr thch hp. V d: Diode s c chia rathnh nhiu rung, nhiu nhit...

    y Nhiu tng u ra v nhiu tng ng u vo.Nhiu u ra: Gi tr hiu dng ca tng nhiu gy bi cc thit b i vi

    u ra.Nhiu u vo: L nhiu tng ng cn thm vo u vo ca mch l

    tng (mch khng c nhiu) to ra mt u ra c nhiu bng nhiu ura( vic ny dng to ra mt mch gn vi mch thc t). tnh cnhiu u vo, Pspice ly nhiu u ra chia cho li mch(t s gia ura / u vo).

    Thit lp phn tch nhiu:y Trong hp thoi Simulation settings, chn AC sweep/noise trong hp Analysis

    type.y Chn General settings trong hp Options.y nh du tick vo hp EnableNoise.y Thit lp cc thng s cho vic m phng:

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    OutputVoltage: mt bin in p u ra theo dng V(node,[node]), trong node l v tr bn mun tnh tng nhiu u ra.

    I/V Source: Tn ca ngun p hay ngun dng c lp m bn mun tnhtng nhiu u vo tng ng.

    Interval: in vo tn s th n (n l mt s nguyn dng), ti nhng tn

    s bn s thy c nhiu do cc linh kin thnh phn, nhng d liuny c to ra trong file .OUT ca Pspice. Trong ca s Probe, bn c thquan st c tt c nhiu ca linh kin ti tn s ch nh khi thit lp phntch AC sweep, Thng s Interval khng nh hng ti nhng g Pspicetrnh by trn file d liu Probe.

    y Bm OK lu thit lp cho file m phng.

    y Sau khi bm Run hoc F11 thc hin m phng, bn chn AddTrace t menu

    Trace hoc bm vo biu tng chn nhng i lng mun xem dng

    sng. Bn c th chn cc i lng theo nhng thng s sau:

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    xem Dng bin u ra nh sauNhiu rung cho mi linh kin

    Nhiu vch cho mi linh kin

    Nhiu nhit cho RB, RC, RE, RD, RG, RSca cc thit b trn

    Nhiu nhit to bi cc in tr tngng u ra ca thit b sTng nhiu cho mt thit b

    Tng nhiu u ra cho mt mchGi tr hiu dng ca tng nhiu u ra chomt mch

    Nhiu tng ng u vo ca mch

    NFID(tn-linh-kin)NFIB(tn-linh-kin)NSID(tn-linh-kin)NSIB(tn-linh-kin)

    NSIC(tn-linh-kin)NRB(tn-linh-kin)NRC(tn-linh-kin)NRD(tn-linh-kin)NRE(tn-linh-kin)NRS(tn-linh-kin)NRG(tn-linh-kin)NRLO(tn-linh-kin)NRHI(tn-linh-kin)NTOT(tn-linh-kin)

    NTOT(ONOISE)V(ONOISE)

    V(INOISE)

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    3.2.3.4. Phn tch Transient v FourierDng phn tch ny cho php phn tch hot ng ca mch da trn theo thi gian.Phn tch Transient v Fourier c th thc hin cc dng phn tch sau:

    y Transient: Phn tch in p, dng in v cc trng thi s theo thi gian.y Fourier: Phn tch thnh phn mt chiu v phn tch dng sng theo chui

    Fourier (theo kt qu ca phn tch Transient).

    3.2.3.4.1. Phn tch Time domain (Transient)iu kin thc hin phn tch Time domain (Transient):

    y Trong mch phi c mt trong nhng ngun c lp bin i theo thi giansau(ngun ny c th c to ra t cng c Stimulus Editor hoc c ly t thvin linh kin ca Orcad Pspice):

    Ly t K hiu Ch giiStimulus Editor VSTIM

    ISTIMDIGSTIM1DIGSTIM2DIGSTIM4DIGSTIM8DIGSTIM16DIGSTIM32

    Ngun p

    Ngun dngNgun m phng s

    Th vin Orcad Pspice VSRCVEXPVPULSE

    VPWLVPWL_RE_FOREVERVPWL_F_RE_FOREVERVPWL_N_TIMESVPWL_F_N_TIMESVSFFMVSINISRCIEXPIPULSE

    IPWLIPWL_RE_FOREVERIPWL_F_RE_FOREVERIPWL_N_TIMESIPWL_F_N_TIMESISFFMISINDIGCLOCK

    Ngun p

    Ngun dng

    Tn hiu xung ng h

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    STIM1STIM4STIM8STIM16FILESTIM1

    FILESTIM2FILESTIM4FILESTIM8FILESTIM16FILESTIM32

    Ngun m phng s

    File m phng s

    y Thit lp iu kin u cho cc phn t th ng.y Trong mch phi c mt ngun iu khin theo thi gian.

    Thit lp m phng Timedomain (Transient):y Trong hp thoi Simulationsettings, chn Timedomain (Transient) trong phn

    Analysistype.y Chn Generalsettings trong phn Options.y Thit lp cc thng s cn thit cho m phng.y Bm OK lu cc thit lp va ci t.

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    3.2.3.4.2. Phn tch Fourier thit lp phn tch Fourier bn phi thc hin phn tch Time domain (Transient).Thit lp phn tch Fourier:

    y Trong hp thoi Simulationsettings, chn Timedomain (Transient) trong phnAnalysistype.

    y Chn Generalsettings trong phn Options.

    y Chn trong phn Generalsettings.y Trong hp thoi TransientOutputfileoptions, tick chn PerformFourier

    Analysis.

    y Thit lp cc thng s cn thit cho m phng.y Bm OK lu cc thit lp va ci t.

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    Lu khi phn tch Fourier:y Phn chu k ly mu trong phn tch Fourier bng bc nhy c ch nh trong

    phn tch Transient. (Phn ny c thit lp bi Print values in the outputfile)

    y trng thi mc nh, phn tch Fourier s hin th thnh phn DC v t sng hi

    th nht n sng hi th 9. Nhng bn cng c th thit lp hin th ton b dng

    sng hi ca phn tch Fourier bng cch chn biu tng trong ca s Probeca Pspice A/D khi tin hnh m phng.

    3.2.4. Cc dng phn tch nng cao gm nhiu phn tch cng lcCc loi phn tch nng cao hoc phn tch nhiu thnh phn mt lc nh phn tchMonte Carlo, parametric, temperature, sensitivity/worst-case, s cho kt qu l hng lotcc phn tch DC sweep, AC sweep, transient tu thuc vo loi phn tch c bn m bnchn.

    3.2.4.1. Parametric v TemparatureTrong dng phn tch ny, Pspice tnh ton cc tham s khc nhau ca mch ti nhng

    iu kin khc nhau v tham s hay nhit m ngi s dng ch nh.

    3.2.4.1.1. Phn tch Parametric (tham s)Phn tch Parametric l kiu phn tch nhiu thnh phn lp i lp li nhiu ln trong khithay i bin tham s tng (global parametric), bin mu (model parametric), gi trthnh phn hay nhit hot ng ca mch. Bn c th c c kt qu tng t bngcch m phng mch nhiu ln, mi ln vi nhng bin phn tch khc nhau.iu kin thit lp phn tch Parametric:

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    y Thit lp mch theo cc iu kin sau tu theo bin phn tch c chn:

    Loi bin phn tch iu kinVoltage source

    TemperatureCurrent sourcemodel parameter

    global parameter

    phi c ngun in p mt chiu (v dVDC)

    Khng cn iu kinPhi c ngun dng mt chiu (v d IDC)Cc mu c trong PSpice A/D (PSpice A/Dmodel)tham s tng c nh ngha trong Pspice(c file .PARA)

    y Phi dng mt trong nhng phn tch sau: DC Sweep, AC Sweep, TransientAnalysis.

    Thit lp phn tch Parametric:y Trong hp thoi Simulationsettings, chn Timedomain (Transient) trong phn

    Analysistype.y Trong phn Options, nh du tick chn ParametricSweep.y Thit lp cc thng s cn thit cho vic m phng.y Bm OK lu cc thit lp m phng.

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    3.2.4.1.2. Phn tch nhit Phn tch nhit l phn tch mch nhng iu kin nhit khc nhau, nhng nhit ny c th l mt khong nhit hoc mt vi nhit c ch nh trc. Nukhng thit lp cc gi tr nhit cho m phng th vic m phng s c thc hin nhit 27C.

    Thit lp phn tch nhit :y Trong hp thoi Simulationsettings, chn Timedomain (Transient) trong phn

    Analysistype.y Chn Temperature trong phn Options.y Thit lp cc thng s cn thit phn tch.y Bm OK lu cc thit lp va ci t.

    3.2.4.2. Monte Carlo v Sensitivity/worst-caseC 2 dng phn tch trn u phn tch u ra ca mch da trn s thay i ca cc linh

    kin (c chn lm tham s bin i) trong gii hn cho php m ngi s dng tra. Nhng Monte Carlo th phn tch theo s thay i ngu nhin ca linh kin, cnSensitivity/worst-case th phn tch theo s thay i ca linh kin theo tng gi tr, c th

    phn tch theo s thay i ca tng linh kin mt hoc phn tch tng hp tt c cc gitr thay i ca linh kin cng 1 ln.

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    3.2.4.2.1. Phn tch Monte CarloPhn tch ny s cho bit p ng ca mch vi nhng sai s trong gii hn cho php calinh kin khi thc hin cc phn tch nhiu thnh phn, v c th thc hin vi nhiu loi

    phn tch khc nhau (AC, DC, Transient). Trc khi tin hnh phn tch bn phi thitlp cc thng s mu cho linh kin v cc sai s ca linh kin. Vic phn tch ny s to

    ra rt nhiu tham s lm cho file u ra rt ln, nn rt kh cho vic add Trace cng nhd liu file u ra ln s lm cho vic phn tch b chm li kh nhiu.Thit lp phn tch Monte Carlo:

    y Trong hp thoi Simulationsettings chn mt loi phn tch no trong phnAnalysistype.

    y Trong phn Options, chn MonteCarlo/Worst-case.y Chn Moresettings.

    y Chn danh sch gi tr cc tham s mu.y Chn OK lu cc thit lp trn.

    Chc nng lu tham s phn tch ca MonteCarlo: (historysupport)y Chc nng ny s gip bn lu cc tham s phn tch bi cc chng trnh

    phn tch Monte Carlo vo mt file no , sau ny bn c th ly ra dng li khithc hin cc phn tch tip theo.

    y Chc nng ny cng cho php bn thc hin so snh kt qu ca 2 phn tchMonte Carlo bng cch thay i mt hay nhiu gi tr tham s no . Vi loi

    phn tch ny th cc thng s ngu nhin c gi nguyn.y lu cc file phn tch ny, bn lm nh sau:

    Sau khi chn phn tch MonteCarlo/ worstcase trong phn Options, bnbm vo nt MCLoad/Save.

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    Trong hp thoi Load/SaveMonteCarloParameterfile, tick chn Saveparametervaluesinfilename.

    Sau t tn v chn ng dn ti file lu kt qu.Bm Ok lu cc thit lp ca bn.

    y s dng li mt kt qu c sn ca phn tch trc, bn lm nh sau: Sau khi chn phn tch MonteCarlo/ worstcase trong phn Options, bn

    bm vo nt MCLoad/Save. Trong hp thoi Load/SaveMonteCarloParameterfile, tick chn

    Loadparametervaluesinfilename.

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    Chn ng dn ti file kt qu cn dng, file kt qu ny phi c ui l.mcp.

    Bm OK lu cc thit lp ca bn.

    3.2.4.2.2. Phn tch Worst case

    Phn tch Worst case dng tm nhng p ng u ra ca mch da trn nhng iukin gii hn ca cc tham s ca n.Mt s lu khi thc hin phn tch ny:

    y u vo (Input): Phi m bo y cc thng s sau: Dung sai ca tham s. Thng s cho trng hp xu nht (worst case).

    y Phn tch ny khng phi thc hin vi mt tp hp nhiu thng s m ch thchin vi trng hp tt c cc tham s ca mch b y n gii hn cao nht.

    Thit lp phn tch Worst case:y Trong hp thoi Simulationsettings chn mt loi phn tch no trong phn

    Analysistype.y Trong phn Options, chn MonteCarlo/Worst-case.y Tick chn vo Worst-case/Sensityvity.y Thit lp cc thng s cho m phng.y Bm OK lu cc thng s va thit lp.

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    3.2.5. M phng sM phng s l m phng nhng p ng ca linh kin s theo thi gian. Vic ny cPspice thc hin theo phn tch Transient. Nu tnh ton im phn cc th Pspice cngxem linh kin s nh nhng linh kin tng t trong mch.Cc u vo s c dng trong m phng s:

    Nu mun to u vo s tcng c ...

    Th s dng thnh phn ... Cho nhng loi u vo sc th sau ...

    Dng Stimulus EditorDng cc linh kin trongLibrary

    DIGSTIMnDIGCLOCKSTIM1STIM4STIM8STIM16FILESTIM1

    FILESTIM2

    FILESTIM4

    FILESTIM8

    FILESTIM16

    FILESTIM32

    ngun tn hiu hoc bustn hiu ng htn hiu kch thch 1 bittn hiu kch thch 4 bittn hiu kch thch 8 bittn hiu kch thch 16 bittn hiu kch thch dng file

    1 bit (1 bit file based)tn hiu kch thch dng file2 bit (2 bit file based)tn hiu kch thch dng file4 bit (4 bit file based)tn hiu kch thch dng file8 bit (8 bit file based)tn hiu kch thch dng file16 bit (16 bit file based)tn hiu kch thch dng file

    32 bit (32 bit file based)

    Thit lp mt m phng s:y Trong hp thoi Simulationsettings, chn tab Analysis, chn Timedomain

    (transient) trong hp Analysistype.y Thit lp thng s cn thit cho m phng.

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    y Trong tab Options ca hp thoi Simulationsettings chn Gate-levelsimulation.

    y Bm OK lu cc thit lp va ci t.

    3.3. V d3.3.1. V d m phng mt s mch tng t3.3.1.1 . M phng mt mch theo phn tch DC3.3.1.1.1. DC SweepThc hin qut DC vi mch K, chn thng s qut l ngun p mt chiu Vin vi gii hn

    qut t -10 n 20 V, bc nhy 1V.

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    V

    V

    R133k

    R32.2k

    R41k

    R210k

    V29V

    R51k

    out

    0

    0

    Q2

    Q2N2222

    in

    Vin0

    Thit lp Simulation settings nh sau:

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    Dng sng c c sau khi m phng nh sau:

    3.3.1.1.2. DC Sweep/ secondary sweepThc hin qut th cp vi mch sau:

    V

    V

    R133k

    R32.2k

    R41k

    R210k

    V29V

    R51k

    out

    0

    0

    Q2

    Q2N2222

    in

    Vin0

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    Thit lp Simulation settings nh sau:

    Dng sng c c sau khi m phng nh sau:

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    3.3.1.1.3. H c tuyn v ng tiM phng biu din c tuyn ca BJT Q2SC945:

    Q1

    Q2SC945V1

    0Vdc

    V2

    0Vdc

    0

    Chn ngun s cp V1 : Start value: 0VEnd value: 1VIncrement: 0.01V

    Chn ngun th cp V2: Start value: 0VEnd value: 5VIncrement: 0.01V

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    Thit lp Simulation settings nh sau:

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    Dng sng c c sau khi m phng nh sau:

    T menu Trace-> Add trace, nhp vo khung Trace Expression phng trnh ng ti nh sau:(5V-V_V2)/50 vi ti c gi tr 50Kt qu m phng nh sau:

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    3.3.1.2 . M phng mt mch theo phn tch bias point (im phn cc)3.3.1.2.1. Phn tch Bias pointPhn tch Bias point mch sau :

    RBIAS20k

    RS2

    1k

    RS1

    1k

    Q1Q2N2222

    Q2Q2N2222

    Q3Q2N2222

    Q4Q2N2222

    C1

    5p

    out2out1

    V1

    V2

    12V

    V3

    -12V

    00

    VEE

    VDD

    VEE

    VDD

    R1

    1k

    R2

    1k

    0 Thit lp Simulation settings nh sau:

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    Kt qu c c sau khi m phng nh sau:

    3.3.1.3. M phng mt mch theo phn tch AC/Noise3.3.1.3.1. Phn tch AC SweepThc hin phn tch AC Sweep i vi mch sau:

    C1

    0.1u

    C3

    1n

    V1

    AC = 1VTRAN =

    DC = 0V

    R16k

    R33k

    R41k

    R22k

    V210V

    R51k

    0

    0

    Q2

    Q2N2222

    C4

    0.1u

    out

    V

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    Thit lp Simulation settings nh sau:y Trong hp thoai Simulation setting chn AC sweep/Noise trong khung Analysic

    type.y Chn Logarithmic trong AC Sweep type sau nhp gii tn s cn qut vo, ch

    l tn s bt u phi >= 1 HZ.y Nn chn bin tn hiu vo l 1V nu chn thang o logarit.Chn:y Start frequency: 1HZy End frequency : 100kHZy Points/ decade : 300

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    Dng sng c c sau khi m phng nh sau:

    3.3.1.3.2. Phn tch nhiu AC/NoiseThc hin phn tch nhiu cho mch sau:

    C1

    0.1u

    C3

    1n

    V1

    AC = 1V

    T

    AN =

    C = 0V

    R1

    6kR3

    3k

    R41k

    R22k

    V210V

    R51k

    0

    0

    Q2

    Q2N2222

    C4

    0.1u

    out

    V

    Thit lp Simulation settings cho phn tch nhiu:

    y Trong hp thoi Simulation setting chn AC sweep/ Noise trong khung Sweep type.y Chn Enable trong khung Noise analysis, cc thng s ca Noise analysis:

    Output Voltage: u ra cn xc nh nhiu, c dng V(node,[node]). I/V Sources: Tn ca ngun dng hoc ngun p u vo cn xc nh nhiu. Interval:

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    Dng sng c c sau khi m phng nh sau:

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    Nhm 1 Lp 04T1 Page

    Dng sng c c sau khi m phng nh sau:

    3.3.1.5. Phn tch Monte Carlo v Sensitivity/worst case (phn tch nhy)3.3.1.5.1. Phn tch Monte CarloThc hin m phng theo phn tch Monte Carlo mch sau:

    Q2Q2N2222

    Q1Q2N2222

    RS1

    1k

    RS2

    1k

    RBIAS20k

    Q4Q2N2222

    Q3Q2N2222

    1

    5p

    out2out1

    V1

    V3

    -12V

    V2

    12V

    0

    0

    0

    VEE

    VDD

    VEE

    VDD

    R 1

    RES

    1k

    R 2

    RES

    1k

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    Dng sng m phng nh sau :

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    Thit lp simulation settings :

    Kt qu nh sau :

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    3.3.1.6. Phn tch Parametric v nhit 3.3.1.6.1. Phn tch ParametricThc hin phn tch mch sau :

    Q1

    Q2SC4444

    V1

    12VdcR1560

    R2

    100k

    R3

    56kC1

    100uF

    C2

    100uF

    Out

    V2

    FREQ = 1khzVAMPL = 0.5V

    VOFF = 0V

    R4

    50

    R5

    150C3

    220u

    0

    Thit lp simulation settings nh sau :

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    Dng sng ng ra nh sau :

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    3.3.1.6.2. Phn tch nhit Cng vi mch trn bn thc hin phn tch nhit .Thit lp simulation settings nh sau:

    Ta m phng 25C kt qu V(out) nh sau :

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    Ta tin hnh m phng 150C kt qu nh sau :

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    Nhm 1 Lp 04T1 Page

    Kt qu nh sau:

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    1. D Nguyn Hong Anh2. L Hng Hi3. Ng Vy Hu4. Nguyn Th Qunh Trang5. Trn Nguyn Cm T6. Bp Ph Vng Vilayphon7. Nguyn Hong V8. Trn Anh Phng

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    OrCAD Capture: L Hng HiNg Vy Hu

    OrCAD Layout: Nguyn Th Qunh TrangTrn Nguyn Cm TTrn Anh Phng

    OrCAD Pspice: D Nguyn Hong AnhBpPhVng VilayphonNguyn Hong V

    Bin tp Word: D Nguyn Hong AnhTrnh by Slide: Trn Nguyn Cm TThit k ba: Nguyn Hong V

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    TRNG I HC BCH KHOA NNGKHOA IN T-VIN THNG

    Thc hin: Nhm 1 04T1 Nng, thng 11 nm 2007

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