400 GHz HBT differential amplifier using unbalanced feed networks

J. Hacker, M. Urteaga, R. Lin, A. Skalare, I. Mehdi, J. S. Rieh, M. Kim

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


A terahertz differential eight-stage amplifier fabricated using state-of-the-art 125 nm double-heterojunction bipolar transistors (DHBT) is presented. The four-port unit-cell chain is designed for optimum forward differential gain with no even and odd-mode reverse gains. Unbalanced single-ended feed networks are added to preserve the amplifier gain without inducing oscillations. The proposed feed scheme is validated by a stable amplifier operation in 325-to-450 GHz range with the peak gain of 22 dB at 375 GHz.

Original languageEnglish
Article number6293920
Pages (from-to)536-538
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number10
Publication statusPublished - 2012


  • Differential feed
  • InP HBT
  • Terahertz amplifier

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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