[62]

A 60 GHz Down-Conversion Mixer with 6.6 dB Gain and 11 GHz IF Bandwidth in an 80 GHz SiGe HBT Technology

Gang Liu, A. Cagri Ulusoy, Andreas Trasser and Hermann Schumacher

The paper was presented at the German Microwave Conference (GeMiC), Darmstadt, 2011 ( www.gemic2011.tu-darmstadt.de ).

Abstract: In this paper, the authors present a wide-band downconversion mixer with 11 GHz IF bandwidth, which is especially suited for 60 GHz applications. The mixer employs a Gilbert cell mixer core and a transimpedance (TI) load to increase the IF bandwidth. For a fixed LO at 55 GHz with 0 dBm power, a flat conversion gain of 6.6 dB (± 0.4 dB) was measured over the frequency range from 56 GHz to 65 GHz, with both RF and LO driven single-endedly. 3 dB more conversion gain can be achieved when both RF and LO are driven differentially (in simulation). Emitter degeneration is used to improve the linearity and the measured input 1 dB compression point is -10 dBm. The measured LO to RF and LO to IF suppression (with LO driven single-endedly) is better than 25 dB and 37 dB. The mixer is realized using a 0.8 μm SiGe HBT technology with 80 GHz fT and draws 17.2 mA current from a 4V supply.

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Publications Publications, alphabetical order Publications 2008 Publications 2009 Publications 2010 Publications 2011 ICC 2009 PR 01/2009 Final Presentation	[62] A 60 GHz Down-Conversion Mixer with 6.6 dB Gain and 11 GHz IF Bandwidth in an 80 GHz SiGe HBT Technology Gang Liu, A. Cagri Ulusoy, Andreas Trasser and Hermann Schumacher The paper was presented at the German Microwave Conference (GeMiC), Darmstadt, 2011 ( www.gemic2011.tu-darmstadt.de ). Abstract: In this paper, the authors present a wide-band downconversion mixer with 11 GHz IF bandwidth, which is especially suited for 60 GHz applications. The mixer employs a Gilbert cell mixer core and a transimpedance (TI) load to increase the IF bandwidth. For a fixed LO at 55 GHz with 0 dBm power, a flat conversion gain of 6.6 dB (± 0.4 dB) was measured over the frequency range from 56 GHz to 65 GHz, with both RF and LO driven single-endedly. 3 dB more conversion gain can be achieved when both RF and LO are driven differentially (in simulation). Emitter degeneration is used to improve the linearity and the measured input 1 dB compression point is -10 dBm. The measured LO to RF and LO to IF suppression (with LO driven single-endedly) is better than 25 dB and 37 dB. The mixer is realized using a 0.8 μm SiGe HBT technology with 80 GHz fT and draws 17.2 mA current from a 4V supply.