Patent ID: 6993090

Claim:
A distortion compensation apparatus for compensating for a distortion component generated in a device, comprising: first envelope detection means for detecting an input envelope voltage of an input signal supplied to the device; second envelope detection means for detecting an output envelope voltage of an output signal of the device; comparison means for comparing the input envelope voltage detected by the first envelope detection means with the output envelope voltage detected by the second envelope detection means; comparison result correction means for correcting a relationship corresponding to a result of the comparison made by the comparison means indicating which of the envelope voltages is larger; amplitude control signal generation means for generating an amplitude control signal for controlling an amplitude of the input signal based on a correction output of the comparison result correction means; and amplitude control means for controlling a gain of the amplitude of the input signal based on the amplitude control signal generated by the amplitude control signal generation means, wherein the comparison result correction means latches the comparison result of the comparison means, and corrects and outputs one of a digital +1 bit and a digital −1 bit based on a latch value of the result of latching.