What is the difference between Class A and Class B power amplifiers?

Question

Accepted Answer

Class A amplifiers have low efficiency but high linearity, while Class B amplifiers have high efficiency but low linearity.

Class A amplifiers use a single transistor that conducts the entire waveform, while Class B amplifiers use two transistors that each conduct half of the waveform.
Class A amplifiers have a low crossover distortion, while Class B amplifiers have a high crossover distortion.
Class A amplifiers are commonly used in high-fidelity audio applications, while Class B amplifiers are commonly used in power amplification applications.
Class AB amplifiers are a compromise between Class A and Class B amplifiers, offering higher efficiency than Class A and lower distortion than Class B.

Accepted Answer

Class A design is the least efficient but has the highest sound fidelity. Class B design is a little more efficient, but has a lot of distortion. Class AB design packs a punch with power efficiency and superb sound. Class D design offers the highest efficiency but isn't quite as high-fidelity.

What is the difference between Class A and Class B power amplifiers?

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