Abstract

In this paper, the distortion of feedback single stage amplifier is modeled. The phasor method was exploited to obtain the distortion factor expressions of the feedback amplifier. All the nonlinearities, including intermodulation nonlinearity, are considered in the paper. The derivation is simple and easy to understand. These equations provide deep insights into the distortion modeling of the feedback circuit. The theoretical analyses are in accordance with the transistor level circuit simulation.

Key words: Analog integrated circuit, harmonic distortion, nonlinear distortion, intermodulation, feedback amplified.