Patent ID: 6473606
Filing Date: 2002-10-29
Classification: H04B

Abstract:
A radio receiver front end comprising:an AM mixer that mixes a received AM signal with a first selected center frequency signal in an AM receive mode to provide an intermediate AM signal; an FM mixer that mixes a received FM signal with a second selected center frequency signal in an FM receive mode to provide an intermediate FM signal; a bandpass filter having a predetermined frequency response that bandpass filters the first intermediate AM signal in the AM receive mode to provide a bandpass representation of the intermediate AM signal and that bandpass filters the first intermediate FM signal in the FM receive mode to provide a bandpass representation of the intermediate FM signal; a common mixer that selectively mixes, depending upon whether the receiver is in the AM receive mode or the FM receive mode, one of the bandpass representation of the intermediate FM signal and the bandpass representation of the intermediate AM signal with a fixed frequency to generate a signal of substantially 450 kHz in the AM mode and 460 kHz in the FM mode.