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:
Dec. 13, 2016
Filed:
Aug. 25, 2015
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Takayuki Shibasaki, Kawasaki, JP;
FUJITSU LIMITED, Kawasaki, JP;
Abstract
A frequency detection circuit includes: a first comparison circuit configured to output a first comparison result produced by comparison between a second threshold value higher than a first threshold value; a second comparison circuit configured to output a second comparison result produced by comparison between a third threshold value lower than the first threshold value; a third comparison circuit configured to output a third comparison result produced by comparison between the input data, and the first threshold value at second timing of a second clock; a phase detector configured to determine in which one of the areas an edge of the input data is positioned among the three areas produced by dividing a phase in a one-bit width time into three areas; and a phase rotation detector configured to detect a rotation direction of the phase based on a change of a detection result in the phase detector.