Method and circuit for controlling oscillator and apparatus employing the same
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United States of America Patent
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Jul 23, 2019
Grant Date -
May 31, 2018
app pub date -
Aug 23, 2017
filing date -
Nov 30, 2016
priority date (Note) -
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Abstract
An oscillator control circuit includes a zero-temperature coefficient (ZTC) estimator estimating a ZTC voltage based on a supply voltage supplied to the oscillator and a frequency of an oscillation signal output by the oscillator. The ZTC voltage is the magnitude of the supply voltage VDD which corresponds to the ZTC condition for the oscillator. The ZTC estimator generates a bias control signal such that the magnitude of the supply voltage becomes the ZTC voltage.
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