G(m)-Boosted Differential Drain-to-Source Feedback Colpitts CMOS VCO

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This paper proposes a g(m)-boosted differential drain-to-source feedback Colpitts voltage-controlled oscillator (VCO) that allows larger output oscillation amplitude while keeping the switching transistor from triode-mode operation such that lower optimal close-in phase noise can be obtained by delaying the AM-to-FM conversion by the switching transistors. The phase-noise behavior of the proposed VCO is analyzed and compared with previously reported g(m)-boosted Colpitts and conventional NMOS-only LC-VCOs, and it is demonstrated in comparison that the proposed VCO can provide 2- and 4-dB lower optimum figure of merit, respectively. The feedback capacitor ratio effect of the proposed VCO is also explored and shown the directions of the capacitor ratio for better phase noise. The proposed VCO is implemented in 0.18-mu m CMOS for 1.76-1.93-GHz operation. Measurement shows, at 1.84 GHz, the phase noise of - 104 and - 126 dBc/Hz (FOM = dBc/Hz) at 100-kHz and 1-MHz offset, respectively, while dissipating 1.5 mA from 0.9-V supply.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2011-07
Language
English
Article Type
Article
Citation

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, v.59, no.7, pp.1811 - 1821

ISSN
0018-9480
URI
http://hdl.handle.net/10203/99784
Appears in Collection
EE-Journal Papers(저널논문)
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