Frequency mixer with compensated DC offset correction to reduce linearity degradation

Abstract

An apparatus includes a frequency mixer circuit configured to generate a baseband signal based on a local oscillator signal and a radio frequency signal. The apparatus includes a compensation circuit configured to generate a DC offset-compensated signal based on the baseband signal, a DC offset compensation signal, and a second signal. The DC offset compensation signal and the second signal have currents approximately equal in magnitude and opposite in direction. A current of the DC offset-compensated signal is substantially the same as a current of the baseband signal. The compensation circuit may include a DC digital-to-analog converter circuit configured to generate the DC offset compensation signal and the second signal based on a control signal.

Dependencies are inferred from the claim text.