Patent ID: 7272371
Filing Date: 2007-09-18
Classification: H03G,H04B

Abstract:
1. A radio receiver, comprising: a low noise amplifier which amplifies a radio signal; a quadrature demodulator which demodulates the amplified radio signal into a baseband signal; a variable gain amplifier which amplifies the baseband signal; an offset canceller configured to cancel an offset of the baseband signal according to the amplified baseband signal; and a signal intensity detector which detects an intensity of the amplified baseband signal; a gain selector which selects a preset gain from a plurality of preset gains which are set for the low noise amplifier, based on the detected intensity; a monitoring unit configured to monitor the selection of the gain selector in order to obtain a time interval between switching of a gain of the low noise amplifier; a comparator which compares a preset time-interval with the time interval; and