Patent ID: 7679431

Claim:
A combined mixer and buffer circuitry, the circuitry comprising: a transconductance module that is operable to process a differential input voltage signal thereby generating a differential current signal; a passive mixer that is operable to process the differential current signal thereby generating a first output voltage signal and a second output voltage signal, wherein the passive mixer includes a plurality of native n-channel metal oxide semiconductor field-effect transistors (N-MOSFETs); first and second N-MOSFETs, wherein: the first output voltage signal is provided to a source of the first N-MOSFET; and the second output voltage signal is provided to a source of the second N-MOSFET; third and fourth N-MOSFETs, wherein: a gate of the fourth N-MOSFET is coupled to a drain of the first N-MOSFET; a gate of the third N-MOSFET is coupled to a drain of the second N-MOSFET; a drain of the third N-MOSFET is connected to a drain of the fourth N-MOSFET; and a source of the third N-MOSFET and a source of the fourth N-MOSFET correspond to a differential output voltage signal of the circuitry.