1 Design and Analysis of a Self Biased Flicker Noise Cancelling CMOS Direct Conversion Mixer

Abstract — The design of a double balanced CMOS downconversion mixer is presented with a novel calibration scheme for pulse injection flicker noise reduction. This self-biasing calibration technique enables the reduction of the mixers ’ noise figure by over 20dB at baseband frequencies without any additional reference voltages, manual adjustment, or large inductors. This results in simpler IC testing and manufacturing as well as reduced design cost (for an accurate voltage reference). The design is simulated in 90nm CMOS with Verilog-A digital models. In addition, the source and manifestation of flicker noise in mixer parameters is analyzed. I