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:
May. 15, 2007
Filed:
Mar. 15, 2002
Yoshihiro Matsumoto, Tokyo, JP;
Takashi Kuriyama, Tokyo, JP;
Daijirou Inami, Tokyo, JP;
Masaki Shiraiwa, Miyagi, JP;
Yoshihiro Matsumoto, Tokyo, JP;
Takashi Kuriyama, Tokyo, JP;
Daijirou Inami, Tokyo, JP;
Masaki Shiraiwa, Miyagi, JP;
Nec Corporation, Tokyo, JP;
Abstract
According to a decision threshold voltage controlling method of feeding an optimum decision threshold voltage to a clock and data recovery circuit which converts an optical input signal into an electric signal, extracts a clock component from an input data signal amplified to a predetermined amplitude, and identifies 1 or 0 in the input data signal at a timing of the clock, three decision points are suitably controlled, by selectively performing a process of controlling the spaces of the three decision points, a process of moving the three decision points with their spaces kept as they are, and a process of changing an error pulse measurement time, depending on a measurement result of the error pulse.