Adaptive temperature compensation
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United States of America Patent
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May 12, 2020
Grant Date -
Oct 5, 2017
app pub date -
Mar 29, 2017
filing date -
Mar 31, 2016
priority date (Note) -
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Abstract
A method of compensating for the temperature related frequency drift of an oscillator. The method comprises using an external reference frequency signal to derive oscillator compensation data over a range of operating temperatures, storing the oscillator compensation data in a first table, and, for a given operating temperature, using the first table to obtain corresponding oscillator compensation data and applying that data to provide compensation for the temperature related frequency drift. The method further comprises defining, for the range of operating temperatures, a series of temperature slots each sub-divided into a series of temperature bins. The step of using an external reference frequency signal to derive oscillator compensation data over the range of operating temperatures comprises
- a) measuring an operating temperature and using the external reference frequency signal to determine oscillator compensation values for respective temperatures as the operating temperature varies;b) accumulating the determined oscillator compensation values in corresponding temperature bins of a second table;c) at spaced intervals in time, using the data accumulated in the temperature bins of the second table to determine or update the oscillator compensation data stored for one or more slots in the first table.
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