Patent ID: 8050649

Claim:
An integrated circuit comprising: a mixer operative to frequency downconvert an input radio frequency (RF) signal with a local oscillator (LO) signal and generate an output baseband signal of a mixer core; and an IM2 generator comprising first and second field effect transistors (FETs) operative to receive the input RF signal and generate an intermediate signal having second order intermodulation (IM2) distortion, wherein the intermediate signal is combined with the output baseband signal to cancel IM2 distortion in the output baseband signal of the mixer core, and wherein the IM2 generator further comprises first and second amplifiers, the first amplifier being coupled between a source and a gate of the first FET, and the second amplifier being coupled between a source and a gate of the second FET, wherein the first and second amplifiers have at least two gain settings for generating different amounts of IM2 distortion in the intermediate signal.