A CMOS millimetre wave down-conversion mixer for 76-81 GHz automotive radars

Institute of Microelectronic Circuits and Systems, East China Normal University, Shanghai 200062, China

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Supported by Strategic Priority Research Program of East China Normal University

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    This paper presents a 76~81 GHz CMOS millimeter wave quadrature down-mixer for automotive radars. The transformer-based gm-boosted method is utilized in the pre-amplifier for improving gain performance. A parallel inductor and two cross-coupled transistors with dynamic current-bleeding are combinatorially exploited to resonate the parasitic capacitance between the transconductance stage and the switching stage and improve noise figure and conversion gain. The proposed mmW down-mixer is implemented in a 55-nm CMOS process and the measurement results show that the BW-3dB is 5.5 GHz, the peak gain is up to 4.1 dB with <0.16 dB I/Q mismatch (at 50 Ω load), the input P1dB is -6 dBm and the minimum noise figure is of 19 dB while consuming 40 mW of power. Excellent FOM is achieved by combining above-mentioned techniques.

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RAO Sheng-Yu, SHI Chun-Qi, ZHANG Run-Xi. A CMOS millimetre wave down-conversion mixer for 76-81 GHz automotive radars[J]. Journal of Infrared and Millimeter Waves,2020,39(4):441~446

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  • Received:November 04,2019
  • Revised:July 25,2020
  • Adopted:November 25,2019
  • Online: July 24,2020
  • Published: