Class AB power amplifier

Solution to the crossover distortion:

Provide some forward bias for the base emitter junction.

Fig. 10-6: Class AB amplifier

Fig. 10-7: Complementary push pull amplifier

Two complementary transistors are used (NPN + PNP) , so no transformer is needed any more.

Efficiency: between A and B

Distortion: Moderate

Application: High power stages in audio and radio-frequency applications.