On design of a 55 GHz Si/SiGe HBT frequency doubler operating close to fmax

S. Bruce, M. Kim, A. Rydberg, K. M. Strohm, F. Beißwanger

Research output: Contribution to conferencePaperpeer-review


In this paper we present for the first time experimental results on a frequency doubler using a Si/SiGe HBT as the non-linear element. Despite the high output operating frequency being close to fmax, 67 GHz, for the Si/SiGe HBT, the conversion efficiency in a not completely optimised circuit was founid to be better than -12 dB. The 3 dB bandwidth for the doubler was about 7.4%. These results are found to be comparable to an HFET doubler operating equally close to its fmax. The results agree well with the prediction for the multiplier from a developed physics-based large-signal HBT model. Prediction by the model using harmonic balance simulation at 55 GHz shows that a conversion efficiency for the Si/SiGe HBT of about 5dB can be expected from future optimised circuits.

Original languageEnglish
Number of pages3
Publication statusPublished - 1996
Event1996 26th European Microwave Conference, EuMC 1996 - Prague, Czech Republic
Duration: 1996 Sep 61996 Sep 13


Other1996 26th European Microwave Conference, EuMC 1996
Country/TerritoryCzech Republic

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture
  • Electrical and Electronic Engineering


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