Patent ID: 8670741
Filing Date: 2014-03-11
Classification: H03D

Abstract:
1. A mixer comprising: first and second transistors, wherein the first transistor has a gate configured to receive a local oscillator (LO) drive signal, a source coupled with ground, and a drain, and the second transistor has a gate configured to receive the LO drive signal, a source coupled with ground, and a drain; a radio-frequency (RF) balun having primary and secondary windings, with the primary windings coupled with an RF signal node, a first secondary winding of the secondary windings coupled with a first intermediate frequency (IF) signal node, and a second secondary winding of the secondary windings coupled with a second IF signal node, wherein the first and second IF signal nodes are configured to provide a differential IF signal interface; a first capacitor coupled with the first secondary winding and configured to provide a ground return at a first RF grounding port for an RF signal; and a second capacitor coupled with the second secondary winding and configured to provide a ground return at a second RF grounding port for the RF signal.