Which class of amplifier is known for the highest linearity and least distortion?

The class of amplifier recognized for its highest linearity and least distortion is Class A. In Class A amplifiers, the output transistors conduct for the entire cycle of the input signal, which means they are always on to some extent. This constant conduction leads to minimal signal distortion because the output linearity is maintained across the entire waveform.

Additionally, since Class A amplifiers do not switch off at any point during the signal cycle, they provide a smooth and linear response to the input, resulting in high fidelity for audio signals and other applications where signal integrity is crucial. This characteristic makes Class A amplifiers suitable for high-end audio applications, where sound quality is paramount.

In contrast, other amplifier classes like Class B and Class C are more efficient but might introduce more distortion due to their operation, which involves the transistors being off for part of the signal cycle. Class AB strikes a balance between efficiency and linearity but may not achieve the same level of performance as Class A in terms of distortion and linear fidelity.