Q.Write a note on cross over distortion in power amplifier.

Crossover distortion appears in a class-B push-pull stage near the point where the two transistors hand over conduction. …

[!TLDR]

Both push-pull transistors are off near the zero crossing, clipping the signal there — crossover distortion.

In a class-B push-pull amplifier two transistors conduct on alternate half-cycles, and each is biased at cut-off. A transistor starts conducting only after the input exceeds its base-emitter cut-in voltage (about 0.7 V for silicon). Near the zero crossing of the input, when the signal is between about −0.7 V and +0.7 V, neither transistor conducts, so this small portion of the waveform is missing from the output. The resulting distortion, occurring where conduction crosses over from one transistor to the other, is called crossover distortion. It is eliminated by giving the transistors a small forward bias so that they conduct slightly even at zero signal, which is the class-AB arrangement …