Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2005-08-09
2005-08-09
Appiah, Charles N. (Department: 2686)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C455S255000, C455S258000, C455S264000, C331S176000, C331S17700V, C342S357490
Reexamination Certificate
active
06928275
ABSTRACT:
The frequency error of an oscillator is minimized by characterizing the oscillator. A reference signal from an external source containing a minimal frequency error is provided to an electronic device. The external signal is used as a reference frequency to estimate the frequency error of an internal frequency source. The electronic device monitors parameters that are determined to have an effect on the frequency accuracy of the internal frequency source. Temperature is one parameter known to have an effect on the frequency of the internal frequency source. The electronic device collects and stores the values of the parameters as well as the corresponding output frequency or frequency error of the internal frequency source. The resultant characterization of the internal frequency source is used to compensate the internal frequency source when the internal frequency source is not provided the external reference signal.
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Patrick Christopher
Younis Saed G.
Appiah Charles N.
Bachand Richard
Greenhaus Bruce
Qualcomm Incorporated
Wadsworth Philip
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