Analysis and design of a 1.8-GHz CMOS LC quadrature VCO

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/f/sup 3/ region is developed, and good agreement is found between theory and...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 2002-12, Vol.37 (12), p.1737-1747
Main Authors: Andreani, P., Bonfanti, A., Romano, L., Samori, C.
Format: Article
Language:English
Subjects:
CMOS
Electrical Engineering, Electronic Engineering, Information Engineering
Elektroteknik och elektronik
Energy consumption
Engineering and Technology
Filters
Frequency conversion
Inductors
Noise
Oscillations
Phase error
Phase noise
Q factor
Quadratures
Ring oscillators
Teknik
Transceivers
Tuning
Varactors
Voltage controlled oscillators
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Summary: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/f/sup 3/ region is developed, and good agreement is found between theory and simulation results. A prototype for the QVCO was implemented in a 0.35-/spl mu/m 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/spl deg/.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2002.804352