Apparatus for mobile communication system

摘要

A mobile communication system has a mobile phone in which a voltage is set corresponding to the characteristic variation of a PA even when a PA having characteristic variation is used. The mobile phone employs a polar loop method, which comprises an antenna ( 1 ) for transmission and reception of signal waves; an antenna switch ( 2 ) for switching the transmission mode and the reception mode; a BBLSI ( 3 ) having a function to control the transmission and reception; an RFIC ( 4 ) having a function for modulating and demodulating the transmitted and received signals; and a PA ( 5 ) for amplifying up to the target output power by means of the amplitude modulation at the time of the transmission.