Apparatus for mobile communication system

Abstract

Disclosed is an apparatus for mobile communication system capable of constructing a system such as a mobile phone by setting a voltage corresponding to the characteristic variation of a PA even when a PA having characteristic variation is used. The mobile phone is the one employing the 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, wherein a bias voltage corresponding to the characteristic variation of the PA is set and supplied by a BIASDAC ( 6 ) formed of a register and a DAC so as to achieve the target output power at the time of the amplitude modulation in the PA.

1 . A mobile phone which transmits a signal having an amplitude modulation components and phase modulation components, comprising: 
 an amplifying means for generating the signal;    a control means for controlling transmitting and receiving of signals and for supplying a predetermined characteristic data for a bias voltage or a power source voltage of the amplifying means;    a modulation and demodulation means for modulating a signal to be amplified by the amplifying means and demodulating a receiving signal; and    a voltage generation means for supplying the bias voltage or the power source voltage in accordance with the predetermined characteristic data to the amplifying means,    wherein the voltage generation means has a storage means for receiving and storing the predetermined characteristic data from the control means, included in the modulation and demodulation means, and coupled for setting the bias voltage or the power source voltage between the amplifying means and the modulation and demodulation means or the control means by an analog interface.    
   
   
       2 . A mobile phone which transmits a signal having an amplitude modulation components and phase modulation components, comprising: 
 an amplifying means for generating the signal;    a control means for controlling transmitting and receiving of signals and for supplying a predetermined characteristic data for a bias voltage or a power source voltage of the amplifying means;    a modulation and demodulation means for modulating a signal to be amplified by the amplifying means and demodulating a receiving signal; and    a voltage generation means for supplying the bias voltage or the power source voltage in accordance with the predetermined characteristic data to the amplifying means,    wherein the voltage generation means has a storage means for receiving and storing the predetermined characteristic data from the control means, included in the modulation and demodulation means, and coupled for setting the bias voltage or the power source voltage between the amplifying means and the modulation and demodulation means or the control means by a serial interface using digital signal.