Wideband VCO with triple tuned circuits in C-Ku band

Masaomi Tsuru*, Kenji Kawakami, Ken'ichi Tajima, Kazuhiro Miyamoto, Masafumi Nakane, Moriyasu Miyazaki, Tadashi Takagi

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)


This paper describes a wide-band Voltage Controlled Oscillator (VCO) with the triple oscillation bandwidth and a better flatness of the phase noise in the oscillation bandwidth using triple varactor-tuned circuits. Altering capacitances of varactor diodes connected to every ports of a HBT in the same direction, the oscillation bandwidth of more than 1.5 octaves has been obtained. A fabricated VCO employing the triple-tuned circuits and a GaAs HBT has covered 1.56 octaves bandwidth achieving the phase noise of -114.9 dBc/Hz ± 2.9 dB at 1 MHz offset from the carrier and the output power of 3.4dBm ± 2 dB in C-Ku band.

Original languageEnglish
Title of host publication2005 IEEE MTT-S International Microwave Symposium Digest
Number of pages4
Publication statusPublished - 2005
Externally publishedYes
Event2005 IEEE MTT-S International Microwave Symposium - Long Beach, CA, United States
Duration: 2005 Jun 122005 Jun 17

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
ISSN (Print)0149-645X


Conference2005 IEEE MTT-S International Microwave Symposium
Country/TerritoryUnited States
CityLong Beach, CA


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

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Wideband VCO with triple tuned circuits in C-Ku band'. Together they form a unique fingerprint.

Cite this