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

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4 Author(s)
P. Andreani ; Orsted-DTU, Tech. Univ. of Denmark, Lyngby, Denmark ; A. Bonfanti ; L. Romano ; C. Samori

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°.

Published in:

IEEE Journal of Solid-State Circuits  (Volume:37 ,  Issue: 12 )