The current gain in Class AB push-pull amplifiers is primarily determined by the transistor's Beta (β), which represents the ratio of emitter current (ie) to base current (ib). The formula for current gain is expressed as hfe + 1, where hfe is the current gain of the transistor. In configurations using Darlington pairs, the additional +1 can be disregarded, as the gain is significantly higher. However, for single transistors operating at high currents, the gain may be limited to around 10.
PREREQUISITESElectronics engineers, audio amplifier designers, and students studying amplifier circuits will benefit from this discussion on current gain in push-pull amplifiers.