A triple-tuned ultra-wideband VCO

Masaomi Tsuru*, Kenji Kawakami, Ke N.Ichi Tajima, Kazuhiro Miyamoto, Masafumi Nakane, Kenji Itoh, Moriyasu Miyazaki, Yoji Isota

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We have already proposed a triple-tuned voltage-controlled oscillator (VCO) for achieving an ultra-wideband characteristic. The triple-tuned VCO consists of an active device and three tuned circuits. The fabricated VCO has achieved the oscillation bandwidth of 5.6-16.8 GHz and the phase noise of - 114.9 dBc/Hz +/-2.9 dB at 1-MHz offset from the carrier. In this paper, for the first time, the conditions that the VCO achieves the ultra-wideband characteristic are clarified by formulation and simulation. It is also clarified that a transistor of the larger emitter size is suitable for the wideband VCO. In addition, the performances of the proposed VCO are compared with other reported wideband VCOs. As a result, it is shown that the proposed VCO has achieved the lowest figure of merit in the C-K u-band.

Original languageEnglish
Pages (from-to)346-354
Number of pages9
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number2
Publication statusPublished - 2008 Feb
Externally publishedYes


  • Broadband communication
  • Flip-chip devices
  • Radar applications
  • Tunable circuits and devices
  • Varactors
  • Voltage-controlled oscillators (VCOs)

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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