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:
Mar. 14, 2017
Filed:
Mar. 09, 2016
Microsemi Semiconductor Ulc, Kanata, CA;
Slobodan Milijevic, Ottawa, CA;
Johannes Hermanus Aloysius de Rijk, Rotterdam, NL;
Paul H. L. M. Schram, Bergen op Zoom, NL;
Mark A Warriner, Ottawa, CA;
Microsemi Semiconductor ULC, Kanata, Ontario, CA;
Abstract
Master clock redundancy is provided for a digital phase locked loop having a digital controlled oscillator (DCO) driven by a master clock source, for example, a crystal oscillator. One of a plurality of a crystal oscillators generating clock signals is selected to drive the DCO. The performance of the crystal oscillators is monitored, and the DCO is switched from being driven by a previously selected crystal oscillator to a newly selected crystal oscillator upon loss of a clock signal from the previously selected crystal oscillator or when the performance of the previously selected crystal oscillator falls below a predetermined acceptable level.