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:
Aug. 18, 2009
Filed:
Nov. 07, 2006
Michael Drexler, Gehrden, DE;
Ralf-detlef Schaefer, Celle, DE;
Michael Drexler, Gehrden, DE;
Ralf-Detlef Schaefer, Celle, DE;
Thomson Licensing, Boulogne Billancourt, FR;
Abstract
An electronic circuit includes a first and a second PLL stage (PLL, PLL) that can be switched in parallel or in series depending on locking of the first one of the PLL circuits to an input signal (IN). When in parallel, only the second PLL circuit (PLL) is actively supplying a clock signal to the output of the electronic circuit. The first PLL circuit (PLL) continues trying to lock onto the input signal (IN). A lock detector (LD) monitors the locking status of the first PLL circuit (PLL) to the input signal (IN) and, upon locking, sets switches (S, S) to couple the output of the first PLL circuit (PLL) to the input of the second PLL circuit (PLL), and to couple the output of the second PLL circuit (PLL) to the input of the first PLL circuit (PLL).