Nonlinear distortion compensation amplifying apparatus and nonlinear distortion compensation method

摘要

PROBLEM TO BE SOLVED: To provide a nonlinear distortion compensation amplification device capable of solving a problem of necessity of compensating for distortion generated at a feedback circuit because nonlinear distortion generated at a forward system and distortion generated at a frequency characteristic deviation of a feedback circuit system deteriorate characteristic after distortion compensation.SOLUTION: At testing, a test signal is generated and transmitted to a forward system, and branched to a feedback circuit and a detector circuit at a pre-amplification stage. Frequency characteristic deviations of both circuits are calculated from outputs of both the circuits. From a difference between them, a frequency characteristic deviation of the feedback circuit is calculated and the deviation of the feedback circuit is compensated for with an inverse characteristic of the calculated deviation for nonlinear distortion compensation.