DISTORTION COMPENSATING CIRCUIT

摘要

A distortion compensating circuit capable of simultaneously reducing both the affection of a first memory effect occurring in an envelope signal and that of a second memory effect occurring in a burst signal. In this distortion compensating circuit, an envelope memory PD part (103b) refers to a first distortion compensation coefficient stored in a first LUT (105) to compensate the distortion caused by the first memory effect of the envelope signal. A second adapting part (108) compares an input side burst signal detected by an input side burst detecting part (102) with an output side burst signal detected by an output side burst detecting part (111), calculates a distortion component caused by the second memory effect of the output side burst signal occurring due to a temperature variation of a power amplifying part (112), and calculates, based on temperature information from a temperature sensor (109), a second distortion compensation coefficient. A burst memory PD part (104) refers to the second distortion compensation coefficient to compensate the distortion caused by the second memory effect of the burst signal.