A dual-resonant mode 10/22-GHz vco with a novel inductive switching approach

Szu Ling Liu*, Kuan Han Chen, Albert Chin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


This paper presents a novel dual-band voltage-controlled oscillator (VCO) in a standard 0.18-μm CMOS technology. With special design in the LC tank, the circuit exhibits two oscillation modes in different frequency bands. The frequency band selection is achieved by a switched coupled inductor with the tunable inductance and quality factor. This VCO can operate in a 10-GHz band with 7.6% tuning range and a 22-GHz band with 8% tuning range, while the core circuit draws a dc current of 8.44 mA from a 1.8-V supply voltage. The figures-of-merit at 10- and 22-GHz bands are -184.63 and -181.81 dBc/Hz, respectively. These performances are comparable with state-of-the-art dual-band LC-VCOs.

Original languageEnglish
Article number6203622
Pages (from-to)2165-2177
Number of pages13
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number7
StatePublished - 29 May 2012


  • dual resonance
  • Dual-band voltage-controlled oscillator (VCO)
  • quality factor
  • self-resonance
  • switched LC-VCO

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