Graduate Thesis Or Dissertation
 

An ultra low power frequency reference for timekeeping applications

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/nc580q41m

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  • 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.
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