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Proceedings Paper

Cross-coupled low-phase-noise 5-GHz CMOS VCO using common-source single-ended output stage
Author(s): Ram Singh Rana; Dong Shan Hua
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Paper Abstract

A 5 GHz fully monolithic Voltage Controlled Oscillator for Wireless Local Area Network applications is presented. It is designed using 0.35 μm CMOS process. The proposed structure uses MOS transistor accumulation mode varactors and small value spiral inductors. Unlike the conventional cross coupled CMOS VCO circuit, the use of common source output stage is exploited to observe its effects on phase noise optimization. The principle of operation of common source topology and its trade-offs with design performance parameters are reviewed. At 2.6 V supply, design simulations indicates phase noise performance of -110.3dBc/Hz at 1 MHz offset and turning range of 15.7% spanning from 4.6 GHz to 5.4 GHz with 2.5 V variation in control voltage. Circuit is simulated using Advanced Design System. Circuit theory with design optimization followed by detailed simulation results and layout is discussed.

Paper Details

Date Published: 7 April 2004
PDF: 7 pages
Proc. SPIE 5445, Microwave and Optical Technology 2003, (7 April 2004); doi: 10.1117/12.560892
Show Author Affiliations
Ram Singh Rana, Institute of Microelectronics (Singapore)
Dong Shan Hua, Institute of Microelectronics (Singapore)

Published in SPIE Proceedings Vol. 5445:
Microwave and Optical Technology 2003
Jaromir Pistora; Kamil Postava; Miroslav Hrabovsky; Banmali S. Rawat, Editor(s)

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