Patent ID: 8145170
Filing Date: 2012-03-27
Classification: H03J,H04B,H04N

Abstract:
1. A receiver, comprising: a tracking bandpass filter having an input for receiving an RF input signal, and an output; a tunable lowpass filter having an input coupled to said output of said tracking bandpass filter, and an output; a local oscillator having a first output for providing a local oscillator signal at a frequency chosen to mix a selected channel to a desired intermediate frequency, said local oscillator signal characterized as being a square wave signal at said desired intermediate frequency; and a mixer having a first input coupled to said output of said tunable lowpass filter, a second input coupled to said first output of said local oscillator, and a first output for providing an intermediate frequency (IF) signal at said desired intermediate frequency, wherein said tunable lowpass filter is configured to substantially attenuate said output of said tracking bandpass filter above a third harmonic of said frequency of said local oscillator signal.