A transformer-based X-band CMOS quadrature VCO without current sources

An X-band quadrature voltage-controlled oscillator (QVCO) is fabricated using 0.18-mum CMOS technology. The high impedance of a current source allows a highly effective Q-factor of the LC tank [1]. The proposed X-band CMOS quadrature VCO has low phase noise of - 117.5 dBlHz at 1-MHz offset frequency, despite the absence of a current source, because a transformer can separate the gate bias of series-connected transistors from cross-coupled RF feedback. The VCO can operate under 1.8 V of power supply. The figure of merit (FOM) is 187.5 dB at a 10.3-GHz oscillation frequency, which is the best value among X-band VCOs. (C) 2005 Wiley Periodicals, Inc.
Publisher
JOHN WILEY & SONS INC
Issue Date
2005-02
Language
ENG
Citation

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, v.44, no.4, pp.305 - 307

ISSN
0895-2477
DOI
10.1002/mop.20618
URI
http://hdl.handle.net/10203/3173
Appears in Collection
EE-Journal Papers(저널논문)
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