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

Summary, in English

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/.

• Author: Pietro Andreani; A Bonfanti; L Romano; C Samori
• Department/s: Department of Electrical and Information Technology
• Publishing year: 2002
• Language: English
• Pages: 1737-1747
• Publication/Series: IEEE Journal of Solid-State Circuits
• Volume: 37
• Issue: 12
• Links: http://dx.doi.org/10.1109/JSSC.2002.804352
• Document type: Journal article
• Publisher: IEEE - Institute of Electrical and Electronics Engineers Inc.
• Topic: Electrical Engineering, Electronic Engineering, Information Engineering
• Status: Published
• ISBN/ISSN/Other: ISSN: 0018-9200