Adaptive equalization system for nonlinearities

摘要

An adaptive equalization system for compensating the nonlinearities generated in a traveling-wave tube amplifier comprises an equalization circuit connected to the traveling-wave tube amplifier. The equalization circuit has a series circuit having a distortion generator for providing a high order distortion, a variable phase shifter and a variable attenuator for controlling the phase and the amplitude of the output of the distortion generator, and a delay line connected parallel to said series circuit so that the delay time in the delay line is equal to the delay time in that series circuit. A distortion detector is provided at the output of the traveling-wave tube amplifier for detecting the residual distortion in the output signal, and a distortion control circuit is provided for adjusting the variable phase shifter and the variable attenuator so that the residual distortion at the output of the traveling-wave tube amplifier becomes minimum.