A High Linearity CMOS Micromixer for UWB Systems

A CMOS micromixer for 3-5 GHz UWB receivers is developed in this paper, which employs a modified class-AB input stage so as to achieve high linearity and 50 Omega input matching with single-ended to differential conversion. A LO buffer and an output buffer are integrated in it for on-wafer testing. Our measurement results show that, with a 50 Omega output loaded, it can achieve 5 dB gain in power conversion, 12.5 dB SSB NF, and 4 dBm IIP3. The mixer-core consumes 2.6 mA of current from 1.8 V power supply, and the on-chip area occupied 2 by this mixer with pads excluded is only about 350times400 mum².