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:
Jan. 11, 2011
Filed:
Aug. 20, 2007
Georg Becke, Moosburg, DE;
Gerd Rombach, Freising, DE;
Georg Becke, Moosburg, DE;
Gerd Rombach, Freising, DE;
Texas Instruments Deutschland GmbH, Freising, DE;
Abstract
A phase-locked loop (PLL) circuit includes a reference clock divider with a reference clock input, a phase-frequency detector, a charge pump, a loop filter, a voltage controlled oscillator and a feedback divider. A method of operating the PLL circuit comprises the steps of detecting a failure of a reference clock applied to the reference clock input, disabling the charge pump upon detection of a reference clock failure, monitoring the reference clock to detect restoration of a regular reference clock, upon detection of a regular reference clock, detecting occurrence of the next pulse from the feedback divider, and enabling the charge pump upon detection of the next pulse from the feedback divider.