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A low power X-band CMOS differential VCO

✍ Scribed by Sheng-Lyang Jang; S.-S. Huang; Sheng-Chien Wu; Chien-Feng Lee; M.-H. Juang

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
293 KB
Volume
50
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

This article proposes a 12 GHz low power differential voltage‐controlled oscillator (VCO) based on single‐ended Colpitts oscillators. The differential VCO uses two single‐ended Colpitts VCOs coupled by a pair of pMOS cross‐coupled transistors and a transformer inductor. The differential VCO was fabricated in the TSMC 0.18‐nm CMOS process, it oscillates from 11.46 GHz to 12.45 GHz, and the power consumption is 2.76 mW at the supply voltage of 1.2 V. The measured phase noise at 1‐MHz offset is g110.95 dBc/Hz at the oscillation frequency of 12.42 GHz. The power consumption of the VCO is 2.3 mA when the supplied voltage is 1.2 V. The figure of merit of the VCO is −188.43 dBc/Hz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1389–1392, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23388

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