A 270-GHz CMOS Triple-Push Ring Oscillator with a Coupled-Line Matching Network

Sooyeon Kim, Daekeun Yoon, Jae Sung Rieh

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


A design procedure is proposed for triple-push ring oscillators, and an oscillator employing a coupled line-matching network is developed following the procedure. This stepwise procedure, which uses power-dependent Z-parameters of transistors, is applied to the design of each amplifier stage constituting a ring oscillator based on its steady-state oscillation condition. It is verified with both L-section and T-section topologies assumed for the load of the amplifier stages of a given triple-push ring oscillator, and the differences between the two topologies are compared. Based on the procedure, a 270 GHz triple-push ring oscillator that employs coupled lines for matching networks has been developed in a 65-nm complementary metal-oxide-semiconductor (CMOS) process. The circuit benefits from the advantages of coupled lines such as compact area and simplified layout. The fabricated oscillator exhibits a measured oscillation frequency of around 270 GHz and output power of -10.9 dBm, with phase noise of -96 dBc/Hz at 10 MHz offset.

Original languageEnglish
Article number8738859
Pages (from-to)449-462
Number of pages14
JournalIEEE Transactions on Terahertz Science and Technology
Issue number5
Publication statusPublished - 2019 Sept


  • Complementary metal-oxide-semiconductor (CMOS)
  • Coupled lines
  • Harmonic generation
  • Millimeter wave
  • Oscillators
  • Ring oscillators
  • Submillimeter wave
  • Terahertz
  • Triple push

ASJC Scopus subject areas

  • Radiation
  • Electrical and Electronic Engineering


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