Circuit and method of using time-average-frequency direct period syntheszier for improving crystal-less frequency generator frequency stability
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United States of America Patent
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Nov 18, 2014
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app pub date -
Dec 24, 2013
filing date -
Dec 24, 2013
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Abstract
A Time-Average-Frequency direct period synthesizer is used to improve crystal-less frequency generator's frequency stability. It includes (a) a temperature sensor circuit to compensate temperature-induced frequency instability; (b) a voltage sensor circuit to compensate voltage-induced frequency instability; (c) a calibration circuit to correct manufacture-related frequency error; (d) a frequency control word update circuit to receive the temperature- and voltage-related frequency adjustments, and the calibration-related adjustment, to generate the corresponding frequency control word in a predetermined schedule; (f) a Time-Average-Frequency direct period synthesizer to receive said frequency control word in the predetermined schedule and produce a clock signal with a frequency that is stable and accurate by counteracting the frequency variation caused by crystal-less oscillators' temperature and voltage dependence and correcting the frequency error introduced in manufacture process. Methods of correcting crystal-less oscillators' frequency error and compensating its frequency variation are also disclosed.
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