Patent ID: 8064855

Claim:
A polar modulation transmitter comprising: a polar signal generation circuit that generates an amplitude component signal and a phase component signal from an input signal; a phase modulated signal generation circuit that generates a radio-frequency (RF) phase modulated signal from the generated phase component signal; a power amplifier; a variable amplifier that amplifies the RF phase modulated signal, based on a first scaling factor, and outputs the amplified RF phase modulated signal to the power amplifier; an amplitude control circuit that amplifies the generated amplitude component signal, based on a second scaling factor, and determines a supply voltage to the power amplifier; a detector that detects output power of the power amplifier while the power amplifier is operating in a compressed mode of amplification; and a transmission power controller that has a first scaling factor set for the compressed mode of amplification and a second scaling factor set for a non-compressed mode of amplification, the first and second scaling factor sets having a region where the first and second scaling factor sets overlap around a power border between the compressed mode of amplification and the non-compressed mode of amplification, and the transmission power controller controls transmission power using the first and second sealing factor sets, wherein: based on the output power detected by the detector, the transmission power controller corrects an output of the power amplifier while the power amplifier is operating in the non-compressed mode of amplification.