Digitally reconfigurable ultra-high precision internal oscillator
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United States of America Patent
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Nov 21, 2017
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app pub date -
Oct 18, 2016
filing date -
Oct 30, 2015
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Abstract
A system, method and apparatus for tuning an internal oscillator to a desired frequency F1 is shown and uses an RC delay element that comprises a resistor, a capacitor and a comparator. The method includes receiving a clock signal from an oscillator to be tuned, triggering charging of the RC delay element, and N clock cycles after triggering the charging, the method determines whether the charge on the precision RC delay element is higher than or lower than a reference voltage. Correction to the clock frequency is based on the results.
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