Question

What is the output of a class B amplifier for sinusoidal input?

(a) Sinusoidal amplifier

(b) Half-sinusoidal

(c) Sinusoidal with higher frequency

(d) Square wave

This question was posed to me in unit test.

This intriguing question comes from Push-Pull Class B Amplifier in section Power Amplifier of Analog Circuits

Answer 1

Correct option is (b) Half-sinusoidal

The best explanation: If Q-point is in cut-off, then IC varies only in the positive direction, for saturation, it varies in the negative direction. So the output of Class B amplifier is half sinusoidal. There is no effect in the shape or the frequency of the wave.