300-GHz InP HBT Quadrature VCO with Integrated Mixer

Kiryong Song, Jungsoo Kim, Heekang Son, Junghwan Yoo, Minje Cho, Jae Sung Rieh

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


A 300-GHz quadrature voltage-controlled oscillator (QVCO) integrated with a pair of mixers based on an InP heterojunction bipolar transistor (HBT) technology has been developed. A super-harmonic coupling technique was applied to generate the quadrature signal in the QVCO. The oscillation frequency tuning range is 24.8 GHz (from 286.1 to 310.9 GHz), and the frequency range maintaining the quadrature operation (within ±10°) is 4.8 GHz (297.2-302.0 GHz). The maximum output power of the QVCO was measured as 0.46 dBm at 286.3 GHz. The measured phase noise is -91.4 dBc/Hz with 10 MHz offset at 294.2 GHz. The integrated QVCO-mixer consumes a dc power of 167.5 mW.

Original languageEnglish
Article number8988173
Pages (from-to)419-422
Number of pages4
JournalIEEE Transactions on Terahertz Science and Technology
Issue number4
Publication statusPublished - 2020 Jul

Bibliographical note

Funding Information:
Manuscript received October 18, 2019; revised December 31, 2019; accepted January 25, 2020. Date of publication February 10, 2020; date of current version July 2, 2020. This work was supported by the Institute of Information & Communications Technology Planning & Evaluation (IITP) Grant 2016-0-00185 funded by the Korea Government (MSIT). (Corresponding author: Jae-Sung Rieh.) The authors are with the School of Electrical Engineering, Korea University, Seoul 02841, South Korea (e-mail: acoor@korea.ac.kr; kjs132456@gmail.com; forver2@korea.ac.kr; zombiend@korea.ac.kr; tjswp1231@korea.ac.kr; jsrieh @korea.ac.kr).

Publisher Copyright:
© 2011-2012 IEEE.


  • Heterojunction bipolar transistors (HBTs)
  • quadrature voltage-controlled oscillator (QVCO)
  • terahertz
  • voltage-controlled oscillator

ASJC Scopus subject areas

  • Radiation
  • Electrical and Electronic Engineering


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