Patent ID: 8836426

Claim:
An adaptive linearizer, comprising: a feedback path, a pass bandwidth of which is limited compared to an output signal bandwidth of an amplifier; an analog-to-digital converter that is placed in the feedback path and digitizes an output signal of the amplifier which is fed back by the feedback path; a filter that is placed in the feedback path after the analog-to-digital converter and limits a bandwidth of an output signal of the analog-to-digital converter; a replica unit that introduces interference components into an output signal modeling the characteristic of the amplifier, which have a similar characteristic of interference components induced by a limited pass bandwidth of the feedback path, by introducing interference components similar to those of the filter; a training unit that calculates an inverse characteristic of a characteristic of the amplifier using an error signal between an output signal of the replica unit and the output signal of the amplifier; and a predistorter that distorts a signal to be input to the amplifier according to the inverse characteristic calculated by the training unit.