Low phase noise Ku-band gm-boosting differential Colpitts VCO

Hwann Kaeo Chiou, Sheng Chi Chen

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

10 Scopus citations


A Ku-band gm-boosting differential Colpitts voltage controlled oscillator (VCO) is presented, that relaxes oscillation start-up current requirement in Colpitts oscillator. Experimental results from a 0.18-μm CMOS process validate the gm-boosting design principle. The VCO oscillates at the frequency of 13.725 GHz with 6% tuning range. The current dissipation of the VCO is 4.5 mA from a 0.9 V power supply. The measurements at 13.3 GHz show the phase noise of -84.8 and -113.8 dBc/Hz at 100 kHz and 1 MHz offset, respectively. The calculated figure of merit (FOM) of this VCO is high as -190.2 dB. The chip size including test pads is 0.62 × 0.72 mm2.

Original languageEnglish
Title of host publicationAPMC 2009 - Asia Pacific Microwave Conference 2009
Number of pages4
StatePublished - 2009
EventAsia Pacific Microwave Conference 2009, APMC 2009 - Singapore, Singapore
Duration: 7 Dec 200910 Dec 2009

Publication series

NameAPMC 2009 - Asia Pacific Microwave Conference 2009


ConferenceAsia Pacific Microwave Conference 2009, APMC 2009


  • CMOS
  • Differential Colpitts VCO
  • G-boosting


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