A 15 GHz, -182 dBc/Hz/mW FOM, rotary traveling wave VCO in 90 nm CMOS

Changchun Zhang, Zhigong Wang, Yan Zhao, Sung Min Park

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17 Scopus citations


This letter presents a phase-noise-centric design methodology of a rotary traveling wave voltage controlled oscillator (RTW VCO). Based upon this methodology, a 15 GHz multiphase RTW VCO is realized in a standard 90 nm CMOS process. Particularly, shielded coplanar striplines are exploited to provide better shielding protection and higher characteristic impedance (Z O) with comparable Q-factor than conventional coupled transmission lines. Measured results of the proposed RTW VCO demonstrates the frequency tuning range of 2 GHz, the output power level of - 11.3 dBm, the phase noise of -109.6 dBc/Hz at 1 MHz offset, the clock RMS jitter of 2 p s RMS, and the power dissipation of 12 mW from a single 1.2-V supply. The chip core occupies the area of 0.2 mm 2.

Original languageEnglish
Article number6171883
Pages (from-to)206-208
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number4
StatePublished - Apr 2012

Bibliographical note

Funding Information:
Manuscript received September 06, 2011; revised December 18, 2011; accepted February 03, 2012. Date of publication March 19, 2012; date of current version April 11, 2012. This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (No. 2012.0000699).


  • CMOS
  • phase noise
  • rotary traveling wave (RTW)
  • shielded coplanar stripline
  • voltage-controlled oscillator (VCO)


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