Patent ID: 7535310

Claim:
A polar modulating circuit comprising: a polar coordinate converting portion which produces an amplitude signal from a baseband quadrature signal that is produced from transmission data; a distortion compensation processing portion comprising: a memory portion which stores predistortion distortion compensating process data for a predetermined amplitude correcting process and outputs an amplitude correction signal with respect to the amplitude signal based on the amplitude signal; and an amplitude information adjusting portion which adjusts an amplitude of the amplitude signal, and which performs adjustment of the amplitude of the amplitude signal after the amplitude correcting process or an amplitude signal for referring an amplitude correcting process address of the memory portion; an amplitude modulating portion which produces an amplitude-modulated signal based on an amplitude signal after the predetermined amplitude correcting process is executed in the distortion compensation processing portion; a phase modulating portion which produces a phase-modulated signal in a radio-frequency band based on a signal having at least a phase component of the baseband quadrature signal; and an amplifying portion into which the phase-modulated signal is input as an input high-frequency signal and the amplitude-modulated signal is input as a control signal, thereby producing transmission data in the radio-frequency band.