Patent ID: 7565118

Claim:
A polar modulation transmission apparatus, comprising: an amplitude/phase separation section for separating a baseband signal to be modulated into an amplitude signal and a phase signal; a first antilogarithm/logarithm conversion section for performing antilogarithm/logarithm conversion on the amplitude signal and outputting the resultant signal as a logarithm-represented amplitude signal; a second antilogarithm/logarithm conversion section for performing antilogarithm/logarithm conversion on a transmission power control signal and outputting the resultant signal as a logarithm-represented transmission power control signal; an adder for adding the logarithm-represented transmission power control signal to the logarithm-represented amplitude signal, and outputting the resultant signal as a transmission power-controlled amplitude signal; a logarithm/antilogarithm conversion section for performing logarithm/antilogarithm conversion on the transmission power-controlled amplitude signal and outputting the resultant signal as an antilogarithm-represented amplitude signal; a phase modulation section for performing phase modulation on a high frequency carrier wave signal based on the phase signal and outputting the resultant signal as a high frequency phase-modulated signal; a high frequency power amplifier for performing amplitude modulation on the high frequency phase-modulated signal based on a supply voltage supplied thereto, and outputting the resultant signal as a high frequency transmission signal; and an amplitude signal amplifier for amplifying the antilogarithm-represented amplitude signal and supplying the resultant signal as the supply voltage to the high frequency power amplifier.