Method and apparatus for compensating local oscillator...

H - Electricity – 04 – B

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H04B 1/26 (2006.01) G01S 1/00 (2006.01) G01S 5/14 (2006.01) H03B 1/04 (2006.01) H03J 7/04 (2006.01) H03L 1/00 (2006.01) H03L 1/02 (2006.01) H03L 7/18 (2006.01) H04L 27/00 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2406716

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.

Cette invention concerne une caractérisation d'un oscillateur qui permet de réduire l'erreur de fréquence provoquée par ce dernier. Un signal de référence d'origine extérieure, renfermant une erreur de fréquence minimale, est transmis à un dispositif électronique. Ce signal extérieur, qui sert de fréquence de référence, permet d'estimer l'erreur de fréquence d'une source de fréquence interne. Le dispositif électronique surveille des paramètres dont il est avérés qu'ils ont une incidence sur la précision de fréquence de la source de fréquence interne. Le dispositif électronique recueille et stocke les valeurs de ces paramètres ainsi que la fréquence de sortie correspondante ou l'erreur de fréquence de la source de fréquence interne. La caractérisation de la source de fréquence interne qui en résulte sert à corriger cette dernière en l'absence d'un signal de référence externe.

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