A 275 GHz active vector-sum phase shifter

C. Quan, S. Heo, M. Urteaga, M. Kim

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Terahertz vector-sum phase shifters capable of 360 ° phase control over the frequency range of 240 to 310 GHz are presented. Because the impedance mismatch of the variable-gain amplifiers employed in the phase shifter determines the flatness of the offset phases, a new broadband VGA design with its input and output impedances unaffected by dc bias is introduced. The measured results on the phase shifter fabricated using 0.25 μ m InP HBT technology show incremental phase shifts of 45 ° with an average RMS offset phase error of 3.6 ° and insertion loss of-1 to-13 dB for eight basis dc bias states.

Original languageEnglish
Article number6994870
Pages (from-to)127-129
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number2
Publication statusPublished - 2015 Feb 1

Bibliographical note

Publisher Copyright:
© 2001-2012 IEEE.


  • InP HBT
  • Variable-gain amplifier (VGA)
  • phase shifter
  • terahertz IC

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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