An ultra low power frequency reference for timekeeping applications

dc.contributor.advisor	Mayaram, Kartikeya
dc.contributor.advisor	Fiez, Terri S.
dc.creator	Oporta, Hector Ivan
dc.date.accessioned	2009-04-01T23:19:19Z
dc.date.available	2009-04-01T23:19:19Z
dc.date.copyright	2008-12-17
dc.date.issued	2009-04-01T23:19:19Z
dc.identifier.uri	http://hdl.handle.net/1957/11161
dc.description	Graduation date: 2009	en_US
dc.description.abstract	An ultra low power crystal oscillator that provides a frequency reference for battery powered timekeeping applications is presented. An amplitude control circuit is employed to ensure that minimum current is consumed. A subthreshold voltage regulator provides a supply voltage for the oscillator with minimum current consumption. The oscillator and regulator are designed in a standard 0.18μm CMOS process. Measured results show the regulator works for battery voltages that range from 1.4 - 4.5V. The crystal oscillator consumes a current of 17.6nA at a minimum supply voltage of 0.8V, making it the lowest power crystal oscillator demonstrated to date. The complete system (oscillator and regulator) consumes a current of 30.6nA when a supply voltage of 3.3V is used.	en_US
dc.language.iso	en_US	en_US
dc.subject	Low	en_US
dc.subject	Power	en_US
dc.subject.lcsh	Low voltage systems	en_US
dc.subject.lcsh	Oscillators, Crystal	en_US
dc.title	An ultra low power frequency reference for timekeeping applications	en_US
dc.type	Thesis	en_US
dc.degree.name	Master of Science (M.S.) in Electrical and Computer Engineering	en_US
dc.degree.level	Master's	en_US
dc.degree.discipline	Engineering	en_US
dc.degree.grantor	Oregon State University	en_US
dc.contributor.committeemember	Mayaram, Kartikeya
dc.contributor.committeemember	Fiez, Terri S.
dc.contributor.committeemember	Liu, Huaping
dc.contributor.committeemember	Pavol, Mike