An improved Gm-boosted technique for a K-band cascode Colpitts CMOS VCO

Tzu Yi Lian, Kuan Hsiu Chien, Hwann Kaeo Chiou

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

10 Scopus citations


This paper presents an improved gm-boosted techniques for a K-band cascode Colpitts voltage controlled oscillator (VCO). This modified topology is derivative from conventional gm-boosted technique by using cascoded cross-coupled pairs. By a quantitative small signal analysis, the gm-boosted cascode Colpitts VCO increases its transconductance more than a factor of 0.5[1+(gm1/gm3)(1+C1/C 2)]. A K-band VCO was designed to verify the concept. The measured central frequency of the designed VCO is 25.0 GHz with the tunable frequency range from 25.3 to 24.7 GHz. The core power consumption is 13.2 mW from a power supply of 1.5 V, and -103.1 dBc/Hz phase noise at 1 MHz offset. The maximum output power is -7.5 dBm. The calculated figure of merit (FoM) of this VCO is -180 dBc/Hz.

Original languageEnglish
Title of host publication2013 Asia-Pacific Microwave Conference Proceedings, APMC 2013
Number of pages3
StatePublished - 2013
Event2013 3rd Asia-Pacific Microwave Conference, APMC 2013 - Seoul, Korea, Republic of
Duration: 5 Nov 20138 Nov 2013

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC


Conference2013 3rd Asia-Pacific Microwave Conference, APMC 2013
Country/TerritoryKorea, Republic of


  • Cascode Colpitts
  • CMOS
  • gm-boosted
  • voltage control oscillator (VCO)


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