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A 475 mV, 4.9 GHz Enhanced Swing Differential Colpitts VCO With Phase Noise of -136 dBc/Hz at a 3 MHz Offset Frequency

TitleA 475 mV, 4.9 GHz Enhanced Swing Differential Colpitts VCO With Phase Noise of -136 dBc/Hz at a 3 MHz Offset Frequency
Publication TypeJournal Article
Year of Publication2011
AuthorsBrown, T. W., F. Farhabakhshian, A. Guha Roy, T. S. Fiez, and K. Mayaram
JournalIEEE Journal of Solid-State Circuits
Volume46
Issue8
Pagination1782 - 1795
Date Published08/2011
ISSN1558-173X
Abstract

A new enhanced swing differential Colpitts VCO architecture enables oscillations to go beyond both the supply voltage and ground making it suitable for low voltage operation. Analysis for the oscillation frequency, differential- and common-mode oscillations, amplitude of oscillation, and start-up condition provides insight into oscillator operation and design considerations. Operating at 4.9 GHz, the VCO consumes from 1.9 mW to 3 mW for supply voltages of 400 mV and 500 mV, respectively. The 130 nm CMOS VCO's measured phase noise ranges from -132.6 to -136.2 dBc/Hz at a 3 MHz offset frequency.

DOI10.1109/JSSC.2011.2155770
Short TitleIEEE J. Solid-State Circuits