Patent ID: 6885695

Claim:
A multi-mode receiver for detecting desired radio frequency (RF) signals having relatively wide and narrow bandwidth about a common RF center or carrier frequency, comprising: a front end stage having an antenna input adapted to connect with an antenna responsive to signals over a RF band that includes the desired RF signals, a preselector for amplifying the signals input by the antenna and including a wide band RF filter having a pass band sufficient to pass both of the desired wide and narrow bandwidth signals about the center RF frequency, and a mixer for converting signals output by the preselector to frequencies within an intermediate frequency (IF) band; a first IF channel coupled to an output of the front end stage and including a narrow band IF filter having a pass band of sufficient width for passing first IF signals corresponding to the desired narrow bandwidth signals to an output of the first IF channel, while rejecting signals corresponding to undesired interfering signals at frequencies in the vicinity of the desired narrow bandwidth signals; a second IF channel coupled to the output of the front end stage and having a web band IF filter with a pass band of sufficient width for passing second IF signals corresponding to the desired wide bandwidth signals to an output of the second IF channel; and one or more processors coupled to the outputs of the first and the second IF channels for demodulating and processing the first and the second IF signals; wherein said first IF channel is coupled to the output of said front end stage through the wide band IF filter of the second IF channel; and the processors are configured to process the first and the second IF signals simultaneously.