TEMPERATURE COMPENSATED FREQUENCY ADJUSTMENT IN A METER READING ENDPOINT
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United States of America Patent
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Issued Date -
May 9, 2013
app pub date -
Nov 4, 2011
filing date -
Nov 4, 2011
priority date (Note) -
Abandoned
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Abstract
The presently disclosed subject matter is directed to methods and apparatus enabling production of a stable output from a phase locked loop (PLL) circuit. A crystal controlled oscillator provides a reference signal to the PLL circuit. Temperature variations associated with the crystal cause variations in the operating frequency of the crystal that result in variations of the PLL output frequency. The presently disclosed subject matter compensates for such variations in frequency output by modifying an operation of the PLL circuit based on the temperature variations so that the output frequency remains stable even with temperature induced variations in the reference signal.
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