A filtering technique to lower LC oscillator phase noise
Hegazi, Emad; Sjöland, Henrik; Abidi, Asad A.;
Abstract
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.
Other data
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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