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:
Oct. 29, 2002
Filed:
Apr. 13, 2001
Anthony Chak Keung Soong, Superior, CO (US);
Bruce S. Schwartz, Boulder, CO (US);
Kate Jennings Lainson, Lafayette, CO (US);
David Purdy, Louisville, CO (US);
Telefonaktie Bolaget L.M. Ericsson, Stockholm, SE;
Abstract
An oscillating circuit ( ) includes a quartz crystal oscillator ( ) for generating a clock signal ( ). The clock signal is synchronized to a master signal ( ) during the lock-in periods when the oscillating circuit ( ) has access to the master signal ( ). During the holdover periods when the oscillating circuit ( ) loses access to the master signal ( ), an oscillation frequency function predicts the crystal oscillation frequency in terms the physical parameters, e.g., time and temperature, that may affect the crystal oscillation frequency. The predicted frequency is compared with a standard frequency to generate an error signal. In response to the error signal, a fraction handler block ( ) determines whether adding cycles to or deleting cycles from the clock signal, thereby calibrating the oscillation signal ( ) of the oscillating circuit ( ).