Patent ID: 6989705

Claim:
An RF circuit comprising: a differential pair of inductively loaded LO buffer transistors, each coupled between a positive voltage source and a ground through an inductive load for producing a differential LO drive signal for driving a mixer responsive to a different input signal; a limiter coupled to LO buffer outputs to limit a common mode voltage of the differential LO drive signal; and a bias circuit coupled to the gate electrodes of said LO buffer transistors to provide biasing voltage at the gate electrodes of the LO buffer transistors, wherein the mixer comprises a passive mixer, and wherein the passive mixer comprises: a first plurality of transistors of a first type arranged in a ring configuration; and a second plurality of transistors of a second type, wherein each of the second plurality of transistors is coupled to a corresponding one of the first plurality of transistors, and wherein the passive mixer produces a differential mixer output signal.