A Wide Tuning-Range Triple-Mode CMOS VCO Using Switched-Tunable Inductor

You Da Chen, Albert Chin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


A triple-mode voltage-controlled oscillator (VCO) with a wide tuning range (TR) is demonstrated experimentally by using standard 0.18- μ m CMOS process, with a wide 38.8% frequency TR from 19.93 to 29.52 GHz, a low phase noise of -122.3 dBc/Hz ± 7.8 dBc/Hz at 10-MHz offset frequencies, and an excellent figure of merit (FoM) with TR (FoMT) of -190.3 dBc/Hz. This VCO was realized by a switched-tunable inductor with a 76% inductance tunability, in addition to the MOS varactors. The VCO experiences different equivalent inductances via magnetic flux linkage modification in three different modes.

Original languageEnglish
Article number9478907
Pages (from-to)1063-1066
Number of pages4
JournalIEEE Microwave and Wireless Components Letters
Issue number9
StatePublished - Sep 2021


  • CMOS
  • tunable inductor
  • voltage-controlled oscillator (VCO)
  • wide frequency tuning range (TR)


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