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A 77 GHz SiGe sub-harmonic balanced mixer

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3 Author(s)
Juo-Jung Hung ; Michigan Univ., Ann Arbor, MI, USA ; T. M. Hancock ; G. M. Rebeiz

A novel SiGe 77 GHz sub-harmonic balanced mixer is presented with a goal to push the technology to its limit [SiGe2-RF transistor (fT=80 GHz)]. This new topology uses a compact input network not only to achieve high isolation between the LO and RF ports, but also to result in excellent 2LO-RF isolation. The measured results demonstrate a conversion gain of 0.7 dB at 77 GHz with an LO power of 10 dBm at 38 GHz, LO-RF isolation better than 30 dB, 2LO-RF isolation of 25 dB, and a P1dB of -8 dBm. The mixer core consumes 4.4 mA at 5 V. The circuit demonstrates that SiGe sub-harmonic mixers have comparable performance with GaAs designs, at a fraction of the cost.

Published in:

IEEE Journal of Solid-State Circuits  (Volume:40 ,  Issue: 11 )