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A digitally controlled band-switching VCO using switching inductors and capacitors in 0.18 μm CMOS

✍ Scribed by Tienyu Chang; Jinghong Chen; Jenshan Lin

Publisher: John Wiley and Sons
Year: 2008
Tongue: English
Weight: 372 KB
Volume: 50
Category: Article
ISSN: 0895-2477
DOI: 10.1002/mop.23496

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✦ Synopsis

Abstract

In this article, a digitally controlled band‐switching voltage controlled oscillator (VCO) is designed and fabricated using TSMC 0.18 μm CMOS technology. Design considerations regarding the power requirement and the phase noise of the VCO are discussed. Eight bands are set by three bits, with one bit controlling switching inductors, and two bits controlling switching capacitors. The VCO covers 2.9–3.45 GHz and 3.6–4.3 GHz using varactors for continuous frequency tuning. Phase noise of the VCO stays constant around −110 dBc/Hz at 1 MHz offset for all bands. The fabricated VCO consumes 11 mA of current with 1.8 V supply voltage and has a small size of 730 μm × 660 μm. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1970–1973, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23496

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