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. 07, 2012
Filed:
Dec. 08, 2009
Yasumoto Tomita, Kawasaki, JP;
Masaya Kibune, Kawasaki, JP;
Hirotaka Tamura, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A clock generation circuit includes: a first determination circuit that detects an input signal at a first phase position based on first frequency signal; a second determination circuit that detects the input signal at a second phase position based on second frequency signal; a phase detector that compares output of the first determination circuit and output of the second determination circuit; a first summing circuit which sums comparison result and first control signal; a second summing circuit which sums comparison result and second control signal; a first voltage controlled oscillation circuit which receives output of the first summing circuit and outputs the first frequency signal; a second voltage controlled oscillation circuit which received output of the second summing circuit and outputs the second frequency signal; and a phase adjustment circuit which generates first control signal and second control signal based on first frequency signal and second frequency signal.