A high conversion-gain Q-band InP DHBT subharmonic mixer using LO frequency doubler

Tom Keinicke Johansen, Jens Vidkjær, Viktor Krozer, A. Konczykowska, M. Riet, F. Jorge, Torsten Djurhuus

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The paper presents analysis and design of a Q-band subharmonic mixer (SHM) with high conversion gain. The SHM consists of a local oscillator (LO) frequency doubler, RF pre-amplifier, and single-ended mixer. The SHM has been fabricated in a high-speed InP double heterojunction bipolar transistor (DHBT) technology using coplanar waveguide structures. To the best of our knowledge, this is the first demonstration of an SHM using InP DHBT technology at millimeter-wave frequencies. The measured results demonstrate a conversion gain of 10.3 dB at 45 GHz with an LO power of only 1 mW. The fundamental mixing product is suppressed by more than 24 dB and the Output P-1 (dB) is around -6 dBm. The mixer is broadband with a conversion gain above 7 dB from 40 to 50 GHz. The conversion gain for the fabricated SHM is believed to be among the best ever reported for millimeter-wave SHMs.
Original languageEnglish
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number3
Pages (from-to)613-619
Publication statusPublished - 2008

Bibliographical note

Copyright: 2008 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE


  • coplanar waveguides (CPWs)
  • nonlinear circuit analysis
  • millimeter-wave circuit
  • subharmonic mixer (SHM)
  • heterojunction bipolar transistors (HBTs)
  • mixer analysis
  • monolithic microwave integrated circuits (MMICs)

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