Tran Dang Experiment 16
Transcript of Tran Dang Experiment 16
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Objective:
Experiment 17
A Differentiator Circuit
Lab Prepared By:
Lab Instructor:
Date Performed:
Dang Tran
Kathleen Meehan
4/17/2012
investigate the input-to-output relationship of an op
amp differentiator circuit.
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Derive input-to-output relationship of the amplifier circuit shown in Figure 1.
Which trim pot is required such that the circuit may be adjusted to have a unity scaling factor for a sine
To obtain a unity scaling factor for a sine wave at 1500 Hz:
Rtrimpot = 1.061 kOhm
R1 1.061 kOhm
R2
531 Ohm
C1 0.1 F
C2 0.03 uF
Trimpot to be used for R1
R1 Trimpot 10 kOhm
Analysis
Calculated component values
V_o = -R1*C1*omega*V_i*(t-pi/2)
10 kOhm
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wave at 1500 Hz?
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To attach calculation either insert a text box or picture of tablet-written calculations.
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Attach the required Pspice circuits and outputs
Frequency (f_unity)
500 Hz
1000 Hz
1500 Hz
2000 Hz
2500 Hz
3000 Hz
Practical differentiator
Complete the following tabl
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Ideal Differentiator
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Value of R1to obtain unity
gain: Ideal Differentiator
Value of R1to obtain unity
gain: Practical
Differentiator
6 kOhm 3 kOhm
3 kOhm 1.8 kOhm
2.2 kOhm 1.25 kOhm
1.6 kOhm 1 kOhm
1.25 kOhm 900 Ohm
1.05 kOhm 820 Ohm
e using the results from the PSpice simulations
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Frequency Trim pot Resistance Phase shift
500 320 Ohm -90 degrees
1000 1.52 kOhm -89.9 degrees
1500 1.01 kOhm -89.6 degrees
2000 755 Ohm -89.3 degrees
2500 605 Ohm -89.3 degrees
3000 562 Ohm -89.5 degrees
Frequency Trim pot Resistance Phase shift
500 3.10 kOhm -99.9 degrees
1000 1.60 kOhm -109.2 degrees
1500 1.18 kOhm -117.3 degrees2000 974 Ohm -124.4 degrees
2500 795 Ohm -130.3 degrees
3000 771 Ohm -135.7 degrees
Measurements
Practical Differentiator
Ideal Differentiator
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Angular Frequency Relationship
Reading Voltages on Differentiator Circuit
http://filebox.ece.vt.edu/~LiaB/Experiments/Differentiator/Angular%20Frequency%20Relationship.wmvhttp://filebox.ece.vt.edu/~LiaB/Experiments/Differentiator/Reading%20Voltages%20on%20Differentiator%20Circuit.wmvhttp://filebox.ece.vt.edu/~LiaB/Experiments/Differentiator/Reading%20Voltages%20on%20Differentiator%20Circuit.wmvhttp://filebox.ece.vt.edu/~LiaB/Experiments/Differentiator/Angular%20Frequency%20Relationship.wmv -
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Attach screenshots from the oscilloscope output
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Using the circuit in figure 1, do your PSpice results agree with the condition R1C1 = 1
Using the circuit in figure 2, do your PSpice results agree with the condition R1C1 = 1
What effect do R2 and C2 have on the performance of the circuit in Figure 1 compared to the circuit in Fi
Do your experimental observations of the ideal differentiator agree with your PSpice models and the d
Do your experimental observations of the practical differentiator agree with your PSpice models and th
Notes:
Conclusion
Yes it does
yes, it does
merely unchanging
yes it does
yes it does
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igure 2 between 500 and 3500 Hz?
rivation present in the Background?
e derivation present in the Background?