An all-analog method to enhance amplitude stability in pierce crystal oscillators
Hussein, Karim M.; Hegazi, Emad;
Abstract
This work proposes a simple method to enhance amplitude stability in Pierce crystal oscillator. The method is based on a modification of the conventional Pierce oscillator. The proposed topology is all-analog, yet it does not use an amplifier-based feedback loop for amplitude control, hence, it saves power, reduces complexity, and layout area. The proposed method does not adversely impact oscillator's phase noise, and gives good amplitude control results against process, voltage, and temperature (PVT) variations. An example design for a 40 MHz Pierce crystal oscillator is implemented in a standard 0.13 μm CMOS technology and compared to conventional Pierce oscillator results. The current consumption of the oscillator core is 500 μA off 1.2 V supply. The proposed method is extensible to other CMOS VCOs, including Giga-Hertz ones, to reduce design margins on VCO gain. © 2011 IEEE.
Other data
Title | An all-analog method to enhance amplitude stability in pierce crystal oscillators | Authors | Hussein, Karim M.; Hegazi, Emad | Keywords | Analog amplitude control | CMOS oscillator | Crystal oscillator | Digital amplitude control | Issue Date | 1-Jan-2012 | Publisher | IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC | Journal | IEEE Transactions on Circuits and Systems I: Regular Papers | ISSN | 15498328 | DOI | 10.1109/TCSI.2011.2167270 | Scopus ID | 2-s2.0-84904727348 | Web of science ID | WOS:000300712000002 |
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