Nonlinear model of amplifier based on frequency transfer function

Abstract

Aiming at a better understanding for the physical explanation of amplifier nonlinear distortion and the convenience to get frequency and amplitude range of output signals under condition of multi-frequency input signals, amplifier modeling for nonlinear response based on transfer function is proposed by introducing method for solving the output response in frequency domain and transfer function which is deduced from the gain characteristic. According to the results of simulation example of amplifier, the calculation errors is similar to the traditional Taylor series method by the comparison which shows the approach could effectively reduce the model complexity and save time for calculating output response in frequency domain. The achievements provide amplifier modeling based on transfer function which contributes to the prediction of nonlinear interference in communication system can explain the mechanism for nonlinear phenomena such as the intermodulation distortion and gain compression.