Compensating for temperature-dependent hysteresis in a temperature compensated crystal oscillator
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United States of America Patent
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Dec 25, 2018
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Mar 15, 2018
app pub date -
Sep 9, 2016
filing date -
Sep 9, 2016
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Abstract
Hysteresis causes the temperature dependent frequency characteristic of the crystal of a crystal oscillator to be different when the temperature is rising from a previous colder state and when the temperature is falling from a hotter state. A rising temperature-to-frequency mapping polynomial and a falling temperature-to-frequency mapping polynomial are generated and their evaluations are weighted based on a current temperature and past temperature(s). The weighted evaluations are combined and used in temperature-based frequency compensation of the crystal oscillator.
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