RADIO COMMUNICATION APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a radio such as a cellular telephone communication apparatus which has a function of performing phase modulation and amplitude modulation, and is capable of improving the modulation accuracy of a transmission waveform and spectral regrowth and capable of satisfactorily suppressing noises over a reception frequency band. SOLUTION: The radio communication apparatus employs a polar loop system having a phase control loop for controlling the phase of a carrier wave outputted from a transmission oscillator (TxVCO), and an amplitude control loop for controlling the amplitude of a transmission output signal outputted from a power amplifier circuit (210). The apparatus is constituted in such a way that transmission in a GMSK (Gaussian minimum shift keying) mode and transmission in an 8-PSK mode. This apparatus shares a phase control loop used in the GMSK modulation mode and a phase control loop used in the 8-PSK modulation mode. COPYRIGHT: (C)2004,JPO