A double tuned Ku-Band SiGe-MMIC VCO with variable feed-back capacitor

Koji Tsutsumi, Miki Kagano, Noriharu Suematsu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

6 Citations (Scopus)


A double tuned Ku-Band SiGe-MMIC voltage-controlled oscillator (VCO) with variable feedback capacitor is presented. The proposed VCO employs series varactors in feed-back paths in addition to varactors in tank circuit. By controlling both varactors, this VCO achieves wide tuning range compared to the conventional LC cross-coupled VCO. Furthermore, appropriately biased MOS varactors for feed-back paths realize linear tuning performance. The proposed configuration is experimentally validated with a 0.35μm SiGe-BiCMOS fully integrated VCO. The oscillation frequency of the fabricated VCO varies 14.3GHz to 16.2GHz with 12.5% tuning range, which is increased by 120% from that of the conventional LC cross-coupled VCO.

Original languageEnglish
Title of host publication2006 Asia-Pacific Microwave Conference Proceedings, APMC
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages10
ISBN (Print)4902339099, 9784902339093
Publication statusPublished - 2006
Event2006 Asia-Pacific Microwave Conference, APMC - Yokohama, Japan
Duration: 2006 Dec 122006 Dec 15

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC


Conference2006 Asia-Pacific Microwave Conference, APMC


  • Double tuned
  • Feed-back path
  • LC oscillator
  • SiGe-MMIC
  • Voltage-controlled oscillator(VCO)


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