Patent ID: 8478220

Claim:
A radio frequency (RF) circuit comprising: a first mixer circuit configured to receive a first oscillation signal operating at approximately a first oscillation frequency and an input signal, wherein the first mixer circuit is configured to present an input impedance to the input signal in accordance with an input impedance response of the first mixer circuit; a second mixer circuit operably associated with first mixer circuit and being configured to receive a second oscillation signal operating at approximately a second oscillation frequency; and a reactive circuit having a reactive circuit impedance response, the reactive circuit being operably associated with the second mixer circuit, such that the input impedance response of the first mixer circuit is an impedance image of the reactive circuit impedance response, wherein the first mixer circuit is operable to provide a first frequency offset between the impedance image and the reactive circuit impedance response based on the first oscillation frequency, and the second mixer circuit is operable to provide an additional frequency offset between the impedance image and the reactive circuit impedance response based on the second oscillation frequency.