Patent ID: 8041327

Claim:
A radio frequency (RF) mixing circuit comprising: a quadrature mixer that receives in-phase and quadrature local oscillator (LO) signals, wherein said quadrature mixer comprises a plurality of metal oxide semiconductor field effect transistor (MOSFET) switches driven by said in-phase and quadrature LO signals, and wherein said plurality of MOSFET switches are connected in parallel to one another, each of said MOSFET switch comprises a gate, a drain, and a source, wherein said drain of each of said MOSFET switch are operatively coupled to one another to receive a RF signal, wherein said source of each of said MOSFET switch are operatively connected to a respective impedance, wherein said gate of each of said MOSFET switch to receive said LO signals for turning on said MOSFET switch, and wherein said quadrature mixer down-converts said RF signal; and a plurality of low noise amplifiers (LNAs) operatively connected to said quadrature mixer, said plurality of LNAs presenting an input impedance at a baseband, wherein a first voltage at an input node of said quadrature mixer is equal to a second voltage across said impedance up-converted to a frequency of a LO signal received by said quadrature mixer, wherein said input impedance at a baseband comprises a noise cancelled impedance.