Patent ID: 7457592

Claim:
A polar modulation transmission apparatus comprising: a high frequency power amplifying section capable of subjecting a phase modulated high frequency signal to power amplification according to a voltage applied to a battery terminal of the high frequency power amplifying section; an amplitude signal amplifying section, amplifying and applying to the battery terminal of the high frequency power amplifying section an amplitude modulation signal according to a voltage value applied from a battery to a battery terminal of the amplitude signal amplifying section; a battery voltage conversion section converting and applying to the battery terminal of the amplitude signal amplifying section a battery voltage from the battery in such a manner that power loss at the amplitude signal amplifying section becomes small; and an operation control section causing the battery voltage conversion section to operate so as to apply the battery voltage converted by the battery voltage conversion section to the battery terminal of the amplitude signal amplifying section or halt operation of the battery voltage conversion section so as to apply the battery voltage from the battery directly, based on a transmission power value.