Amplitude distortion in transistor feedback amplifiers

The effects of amplitude distortion are frequently of considerable importance in the design of transistor feedback amplifiers. The analysis of distortion in a transistor amplifier is inherently more complex than in the vacuum-tube counterpart because of two factors. First, the transistor has an input conductance which is nonlinear and of appreciable magnitude in the normal operating frequency range of the device. Second, the device has internal coupling from output to input connections.