A 47 GHz LC cross-coupled VCO employing high-Q island-gate varactor for phase noise reduction

Namhyung Kim, Yongho Oh, Jae Sung Rieh

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10 Citations (Scopus)


A 47 GHz LC cross-coupled voltage controlled oscillator (VCO) employing the high-Q island-gate varactor (IGV) based on a 0.13 μm RFCMOS technology is reported in this work. To verify the improvement in the phase noise, two otherwise identical VCOs, each with an IGV and a conventional multi-finger varactor, were fabricated and the phase noise performance was compared. With VDD of 1.2 V and core power consumption of 3.86 mW, the VCOs with the IGV and the multi-finger varactor have a phase noise of -95.4 dBc/Hz and -91.4 dBc/Hz respectively, at 1 MHz offset, verifying the phase noise reduction with the introduction of the high-Q IGV. The VCO with IGV exhibited an output power of around -15 dBm, leading to a FoM of -182.9 dBc/Hz and a tuning range of 3.35% (45.69 to 47.22 GHz).

Original languageEnglish
Article number5392992
Pages (from-to)94-96
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number2
Publication statusPublished - 2010 Feb

Bibliographical note

Funding Information:
Manuscript received July 18, 2009; revised November 16, 2009. First published January 19, 2010; current version published February 10, 2010. This work was supported in part by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2009-0079994) and a Korea University Grant.


  • Phase noise
  • Varactor
  • Voltage controlled oscillator (VCO)

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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