Patent ID: 8121577

Claim:
A radio frequency (RF) circuit comprising: polyphase reactive circuitry comprising transconductance circuitry; and mixer circuitry comprising: at least one mixer input adapted to: receive at least one mixer input signal; and provide at least one mixer input impedance: based on at least one impedance presented by the polyphase reactive circuitry and mixing the at least one mixer input signal with at least four local oscillator signals having a common local oscillator frequency, wherein an active state of each of the at least four local oscillator signals does not substantially overlap with an active state of any other local oscillator signal; and having at least one impedance peak comprising an impedance quality factor greater than twenty; and at least one mixer output based on the mixing and coupled to the polyphase reactive circuitry; and wherein the one of the at least one impedance peak comprises a maximum impedance at a first frequency, which is shifted from the common local oscillator frequency such that the shifting is based on the transconductance circuitry.