A low-power K-band CMOS VCO with four-coil transformer feedback

Szu Ling Liu*, Kuan Han Chen, Tsu Chang, Albert Chin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


A K-band low-power and low-phase-noise voltage-controlled oscillator (VCO) is presented in this letter. By utilizing four-coil transformer feedback and forward body bias topology, good performances are obtained under a low-power supply with a 5.1% tuning range and a phase noise of -109.8 dBc/Hz at 1 MHz offset from the 21.37-GHz carrier frequency. The core circuit of this VCO only consumes 3.5 mW with a 0.6-V supply voltage and a 0.55-V body bias.

Original languageEnglish
Article number5483161
Pages (from-to)459-461
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number8
StatePublished - 1 Aug 2010


  • Forward body bias
  • K-band
  • low power
  • transformer feedback

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