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. 20, 2009
Filed:
Jul. 12, 2004
Applicants:
Qi Zhang, Milpitas, CA (US);
Atul Ghia, San Jose, CA (US);
Assignee:
Xilinx, Inc., San Jose, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H03D 3/24 (2006.01);
U.S. Cl.
CPC ...
Abstract
Method and apparatus for phase lock detection is described. More particularly, a phase lock detection circuit () includes a synchronization circuit () coupled to receive a reference signal () and configured to provide a derivative signal (). A phase lock detector () is coupled to receive the reference signal () and the derivative signal () and is configured to provide a cycle lock signal () indicating whether a phase lock exists within a lock window () for a clock cycle.