360-µW/1 mW Complementary Cross-Coupled Differential Colpitts LC-VCO/QVCO in 0.25-µm CMOS

Jong-Phil HONG  Seok-Ju YUN  Sang-Gug LEE  

IEICE TRANSACTIONS on Electronics   Vol.E90-C    No.12    pp.2289-2292
Publication Date: 2007/12/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e90-c.12.2289
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electronic Circuits
CMOS,  cross-coupled Colpitts oscillator,  low power,  quadrature VCO,  voltage controlled oscillator (VCO),  

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A complementary cross-coupled differential Colpitts voltage controlled oscillator (VCO) is reported. The combination of gm-boosting and the complementary transistors allows record low power integrated VCO implementation. The proposed VCO and the corresponding parallel quadrature VCO (P-QVCO) are implemented using 0.25-µm CMOS technology for 1.8 GHz operation. Measurements for the VCO and P-QVCO show phase noise of -116.8 and -117.7 dBc/Hz at 1 MHz offset, while dissipating only 0.4 and 1.1 mA from a 0.9-V supply, respectively.