Which class of amplifier has the highest linearity and least distortion?

A Class A amplifier is biased so that its active device conducts current continuously throughout the entire 360 degrees of the input signal cycle. Because the device never turns off or reaches the cutoff point, the output waveform is an exact, amplified replica of the input signal. This continuous operation means the amplifier suffers from no crossover distortion or signal clipping under normal conditions, giving it the highest linearity and the least distortion of all amplifier classes. Distractors like Class B and Class C introduce non-linearity because they stop conducting during parts of the cycle, while Class AB is a compromise that still introduces minor distortion compared to pure Class A.