Microwave low-noise GaAs HBTs

H. Dodo, Y. Amamiya, T. Niwa, M. Mamada, S. Tanaka, H. Shimawaki

Research output: Contribution to journalConference articlepeer-review

8 Citations (Scopus)


In this paper we present our approach to improving microwave noise performance of HBTs. A minimum noise figure of 0.83 dB was obtained at 2 GHz by using an emitter guarding structure which improves the DC current gain particularly at low current densities. We also fabricated HBTs with regrown extrinsic base layers and InGaAs graded base layers which drastically reduce base contact resistance and base transit time, respectively. It is shown that this type of HBTs not only improve the noise-figure at X-band or Ku-band but also make the noise impedance matching easier.

Original languageEnglish
Pages (from-to)693-696
Number of pages4
JournalIEEE MTT-S International Microwave Symposium Digest
Publication statusPublished - 1998 Jan 1
EventProceedings of the 1998 IEEE MTT-S International Microwave Symposium. Part 1 (of 3) - Baltimore, MD, USA
Duration: 1998 Jun 71998 Jun 12

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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