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:
Mar. 20, 2012
Filed:
Dec. 17, 2010
Tomohiro Hayashi, Tokyo, JP;
Tomohiro Hayashi, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
An inter-phase skew detection circuit includes a frequency division circuit that frequency-divides N-phase clocks to be measured at predetermined timings so as to generate N+2 frequency-divided clocks; a phase comparison target clock generation circuit that generates N phase comparison target clocks by using predetermined N frequency-divided clocks among the N+2 frequency-divided clocks; a phase comparison reference clock generation circuit that generates N reference clocks by using the N+2 frequency-divided clocks, in accordance with predetermined combinations between the N+2 frequency-divided clocks and an operation criterion; and a phase comparison circuit that detects respective phase differences between the N phase comparison target clocks and the corresponding N reference clocks.