RECEIVER AND AMPLIFICATION-GAIN CONTROLLING DEVICE THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a receiver whose receiving performance is improved. SOLUTION: A receiver includes: a variable gain amplification unit 241 which amplifies a radio frequency signal depending on the magnitude of an input signal; a frequency conversion unit 242 which performs frequency conversion of the signal amplified by the variable gain amplification unit; a filtering unit 215 which filters the signal frequency-converted by the frequency conversion unit; a first compensation unit 231 which detects power of the signal amplified in the variable gain amplification unit and outputs a first control signal; a second compensation unit 232 which detects strength of the signal frequency-converted in the frequency conversion unit and outputs a second control signal; and a third compensation unit 233 which detects strength of the signal filtered in the filtering unit and outputs a third control signal. Gain of the variable amplification unit is varied by the first control signal, the second control signal and the third control signal. COPYRIGHT: (C)2008,JPO&INPIT