An even harmonic mixer implemented in a 0.25 /spl mu/m standard digital CMOS process for applications in 2 GHz direct conversion receivers is described. The novel mixer circuit overcomes the classical DC offset problems that degrade the sensitivity performance of direct conversion receivers using conventional mixers. Simulated with a 1% g/sub m/ mismatch, the new even harmonic mixer achieves excellent DC offset cancellation and IIP2 values of 87 dB and +40 dBm, respectively. The mixer draws 1.71 mA from a single 3 V power supply.