A 28-GHz, -187.4-dBc/Hz-FOMT Low-Phase-Noise CMOS VCO Using an Amplitude-Redistribution Technique

Yusuke WACHI  Toshiyuki NAGASAKU  Hiroshi KONDOH  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E95-C   No.6   pp.1042-1049
Publication Date: 2012/06/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E95.C.1042
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
millimeter-wave,  CMOS,  VCO,  phase-noise,  

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Summary: 
An amplitude-redistribution technique – which improves phase-noise performance of millimeter (mm)-wave and quasi mm-wave cross-coupled VCOs by controlling the distribution of voltage swings on the oscillator nodes – is proposed. A 28-GHz VCO, fabricated in 0.13-µm CMOS technology, uses this technique and demonstrates low phase-noise performance of -112.9-dBc/Hz at 1-MHz offset and FOMT of -187.4-dBc/Hz, which is the highest FOMT so far reported in regard to CMOS VCOs operating above 25 GHz.