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:
Jun. 07, 2005
Filed:
Jul. 09, 2003
Kenichi Sasaki, Kanagawa, JP;
Shinichi Uchino, Kanagawa, JP;
Yasushi Aoki, Kanagawa, JP;
NEC Eelctronics Corporation, Kanagawa, JP;
Abstract
A clock extracting part has a first phase comparator circuit, a first up/down counter, a weighting circuit, a charge pump and a low-pass filter forming a voltage value determining part, and a voltage controlled oscillator circuit. A retiming clock generating part has a second up/down counter and a phase switching circuit. Furthermore, a phase adjusting part has a first counter, a second counter, a second phase comparator circuit and a third up/down counter forming a phase adjusting part. A clock data recovery circuit is formed by said clock extracting part, the retiming clock generating part, the phase adjusting part, and a first-in first-out memory part. Thereby, a clock data recovery circuit is obtained, in which jitter transfer characteristics and jitter tolerance satisfy the standards of both the SONET and SDH.