The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 27, 2010
Filed:
Jul. 12, 2008
Charles Nicholls, Nepean, CA;
Charles Nicholls, Nepean, CA;
Nortel Networks Limited, St. Laurent, Quebec, CA;
Abstract
A system and method include receiving an external reference signal and generating first temperature control commands to maintain a constant ambient temperature for a crystal oscillator using a first temperature control system. The method further includes generating second temperature control commands for a second temperature control system to establish a desired ambient temperature for the crystal oscillator according to a temperature training profile. While at least one of the first and second temperature control systems operates to change an ambient temperature, the method includes extracting a clock from the external reference signal, generating a correction signal to further generate a corrected oscillation based on a difference between the extracted clock and the crystal oscillator and training an adaptive control algorithm based on the correction signal in relation to a determined crystal oscillator response to temperature variations caused by the second temperature control system.