1 Figure Class AB output stage. A bias voltage V BB is applied between the bases of Q N and Q P, giving rise to a bias current I Q given by Eq. (14.23). Thus, for small v I, both transistors conduct and crossover distortion is almost completely eliminated. Class AB Output Stage transfer characteristic

2 Figure Determining the small-signal output resistance of the class AB circuit of Fig Output Resistance

3 Figure A class AB output stage utilizing diodes for biasing. If the junction area of the output devices, Q N and Q P, is n times that of the biasing devices D 1 and D 2, and a quiescent current I Q = nI BIAS flows in the output devices. Biasing Class AB Circuit Using Diodes

4 Figure A class AB output stage utilizing a V BE multiplier for biasing. Biasing Class AB Circuit Using the V BE Multiplier