Method and apparatus for temperature compensation of a reference oscillator in a communication device
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United States of America Patent
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Apr 14, 1998
Grant Date -
N/A
app pub date -
May 10, 1996
filing date -
May 10, 1996
priority date (Note) -
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Abstract
A reference oscillator (118) in a communication device (100) such as a radiotelephone is controlled by temperature compensating the reference oscillator (118). At the time of manufacture, characterizing data are stored in non-volatile memory (128) in the communication device (100). When the communication device (100) is powered up, the characterizing data are read and used to provide an initial correction (206) to the output frequency of the reference oscillator (118). Subsequently, an automatic frequency control operation is performed using the RF signal received from a remote transmitter as a reference signal. A frequency correction is determined (214) in the form of a frequency step size and step direction. The output frequency of the reference oscillator is repeatedly stepped until frequency error is minimized.
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