1

Class AB Output Stage

/ 2BB TV VQ S

N P L

BEN EBP BB

I I e

i i iv v V

transfer characteristic

2

Output Resistance

out

0.025 V

eN eP

Te

T

R r rVri

V

3

If the junction area of the output devices, QN and QP, is n times that of the biasing devices D1 and D2, a quiescent current IQ = n IBIAS flows in the output devices.

Biasing Class AB Circuit Using Diodes

BIASQI n I

4

Biasing Class AB Circuit Using the VBE Multiplier

1

1

BERVIR

1 /BIAS 1

BE TV VR SI I I e