Analysis and Design of a 1.8-GHz CMOS LC Quadrature VCO

Pietro Andreani; A. Bonfanti; L. Romanò

doi:10.1109/JSSC.2002.804352

Analysis and Design of a 1.8-GHz CMOS LC Quadrature VCO

Pietro Andreani, A. Bonfanti, L. Romanò

Department of Electrical Engineering

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

This paper presents a quadrature voltage-controlled oscillator (QVCO) based on the coupling of two LC-tank VCOs. A simplified theoretical analysis for the oscillation frequency and phase noise displayed by the QVCO in the 1/f3 region is developed, and good agreement is found between theory and simulation results. A prototype for the QVCO was implemented in a 0.35-μm CMOS process with three standard metal layers. The QVCO could be tuned between 1.64 and 1.97 GHz, and showed a phase noise of -140 dBc/Hz or less across the tuning range at a 3-MHz offset frequency from the carrier, for a current consumption of 25 mA from a 2-V power supply. The equivalent phase error between I and Q signals was at most 0.25°.

Original language	English
Journal	I E E E Journal of Solid State Circuits
Volume	37
Issue number	12
Pages (from-to)	1737-1747
ISSN	0018-9200
DOIs	https://doi.org/10.1109/JSSC.2002.804352
Publication status	Published - 2002

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Copyright: 2002 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

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title = "Analysis and Design of a 1.8-GHz CMOS LC Quadrature VCO",

abstract = "This paper presents a quadrature voltage-controlled oscillator (QVCO) based on the coupling of two LC-tank VCOs. A simplified theoretical analysis for the oscillation frequency and phase noise displayed by the QVCO in the 1/f3 region is developed, and good agreement is found between theory and simulation results. A prototype for the QVCO was implemented in a 0.35-μm CMOS process with three standard metal layers. The QVCO could be tuned between 1.64 and 1.97 GHz, and showed a phase noise of -140 dBc/Hz or less across the tuning range at a 3-MHz offset frequency from the carrier, for a current consumption of 25 mA from a 2-V power supply. The equivalent phase error between I and Q signals was at most 0.25°.",

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AU - Andreani, Pietro

AU - Bonfanti, A.

AU - Romanò, L.

N1 - Copyright: 2002 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

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AB - This paper presents a quadrature voltage-controlled oscillator (QVCO) based on the coupling of two LC-tank VCOs. A simplified theoretical analysis for the oscillation frequency and phase noise displayed by the QVCO in the 1/f3 region is developed, and good agreement is found between theory and simulation results. A prototype for the QVCO was implemented in a 0.35-μm CMOS process with three standard metal layers. The QVCO could be tuned between 1.64 and 1.97 GHz, and showed a phase noise of -140 dBc/Hz or less across the tuning range at a 3-MHz offset frequency from the carrier, for a current consumption of 25 mA from a 2-V power supply. The equivalent phase error between I and Q signals was at most 0.25°.

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