A filtering technique to lower LC oscillator phase noise

Hegazi, Emad, Sjöland, Henrik, Abidi, Asad A.,


Based on a physical understanding of phase-noise mechanisms, a passive LC filter is found to lower the phase-noise factor in a differential oscillator to its fundamental minimum. Three fully integrated LC voltage-controlled oscillators (VCOs) serve as a proof of concept. Two 1.1-GHz VCOs achieve -153 dBc/Hz at 3 MHz offset, biased at 3.7 mA from 2.5 V. A 2.1-GHz VCO achieves -148 dBc/Hz at 15 MHz offset, taking 4 mA from a 2.7-V supply. All oscillators use fully integrated resonators, and the first two exceed discrete transistor modules in figure of merit. Practical aspects and repercussions of the technique are discussed.

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Title A filtering technique to lower LC oscillator phase noise
Authors Hegazi, Emad ; Sjöland, Henrik; Abidi, Asad A.
Keywords Analog integrated circuits | CMOS oscillators | Noise filtering | Optimization | Phase noise | Radio frequency | Spiral inductors | Voltage-controlled oscillators
Issue Date 1-Dec-2001
Journal IEEE Journal of Solid-State Circuits 
ISSN 00189200
DOI 10.1109/4.972142
Scopus ID 2-s2.0-0035696224

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