HIGH-FREQUENCY RECEIVER, HIGH-FREQUENCY RECEIVING METHOD, LSI FOR HIGH-FREQUENCY SIGNAL, AND LSI FOR BASEBAND SIGNAL

摘要

PROBLEM TO BE SOLVED: To perform optimal gain control of RF and IF while suppressing saturation amplification by interference.;SOLUTION: The receiver includes an RF variable gain amplifier 2 for amplifying a received RF signal, a mixer 4 for converting the output signal S2 from the RF variable gain amplifier 2 into an IF signal, an IF variable gain amplifier 6 for amplifying an converted IF signal, a demodulator 8 performing demodulation processing based on the output signal S6 from the IF variable gain amplifier 6, and an AGC circuit 10. When the gain of the RF variable gain amplifier 2 and the IF variable gain amplifier 6 is controlled based on the output signal S6 from the IF variable gain amplifier 6, the AGC circuit 10 sets a period of gain control for the RF variable gain amplifier 2 smaller than that for the IF variable gain amplifier 6.;COPYRIGHT: (C)2009,JPO&INPIT