Patent ID: 8369801

Claim:
A multimode polar modulation transmitter, comprising: a first control section which selects a modulation system of a transmission modulation signal; a signal generation section which generates a baseband quadrature signal according to the modulation system selected by the first control section based on transmission data; a polar conversion section which generates an amplitude signal from the baseband quadrature signal; an amplitude modulation section which generates an amplitude modulation signal based on the amplitude signal; a phase modulation section which generates a phase modulation signal in a radio frequency band based on a signal containing at least a phase component of the baseband quadrature signal; an amplification section which generates transmission data in the radio frequency band, the amplification section in which the phase modulation signal is input as an input high frequency signal and the amplitude modulation signal is input as a control signal; a distortion compensation processing circuit which performs predetermined distortion compensation processing for at least one of the input signal to the amplitude modulation section and the input signal to the phase modulation section; and a second control section which switches between calibration operation of compensation data used in said distortion compensation processing circuit and transmission operation, wherein at the calibration operation time, the first control section selects a modulation system in which an amplitude dynamic range becomes equal to or less than an amplitude dynamic range of a modulation signal in the modulation system used at the transmission operation time.