Patent ID: 7139543

Claim:
A system for the reduction of distortion in a wireless communication circuit having an RF combined signal including a desired signal and an out of band jammer signal, comprising: a down mixer in a feedforward path configured to frequency convert at least a portion of the RF combined signal to substantially a baseband signal; a filter in the feedforward path coupled to the down mixer and configured to remove the desired signal from the baseband signal and thereby provide a filtered signal representative of the jammer signal; an up mixer in the feedforward path coupled to the filter and configured to frequency convert the filtered signal to an upconverted filtered signal at substantially an RF frequency of the jammer signal; an adder circuit to receive the combined signal and the upconverted filtered signal from the feedforward path to thereby remove the jammer signal therefrom, wherein the adder circuit comprises a positive and negative input, the combined signal being coupled to the positive input and the upconverted filtered signal being coupled to the negative input; and a signal mixer coupled to an output of the adder circuit.