Patent ID: 6721370
Filing Date: 2004-04-13
Classification: H03F,H03G

Abstract:
A phase correction circuit for a radio communication apparatus, comprising:a variable gain amplifier for amplifying a reception signal on the basis of a gain variably set in accordance with a gain control signal; demodulation means for demodulating the amplified reception signal (outputted from said variable gain amplifier) into I and Q components on an I-Q plane; A/D conversion means for converting the I and Q components output from said demodulation means into digital signals; and phase correction means, having a phase characteristic opposite to a phase characteristic of said variable gain amplifier, for increasing/decreasing the digital I and Q components output from said A/D conversion means on the basis of the gain control signal supplied to said variable gain amplifier, and canceling a phase change of the reception signal caused by said variable gain amplifier.