Patent ID: 7817977

Claim:
A method of generating an output signal, comprising: receiving an input signal; mixing the input signal with a reference signal having a reference frequency to obtain a first intermediate frequency signal having a first intermediate frequency that is variable in response to detecting an undesirable noise signal in the output signal; filtering the first intermediate frequency using a reference path filter having a filter characteristic that is configured according to the intermediate frequency of the intermediate frequency signal; and performing frequency translation on the filtered intermediate frequency signal to obtain the output signal, comprising: comparing the filtered first intermediate frequency signal with a feedback signal to generate a difference signal; applying the difference signal to a voltage controlled oscillator to generate the output signal; performing frequency translation on the output signal to generate a second intermediate frequency signal having a center frequency that is approximately the first intermediate frequency; and filtering the second intermediate frequency signal via a feedback path filter to generate the feedback signal, wherein the feedback path filter has a filter characteristic that is configured according to the first intermediate frequency.