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. 09, 1997
Filed:
Sep. 19, 1995
Yoshihiro Hashimura, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
Disclosed is a phase difference detection circuit for detecting a phase difference between an equalized signal obtained by equalizing an extended partial-response class-4 signal and a sampling clock. This phase difference detection circuit has a sample hold circuit for sampling and holding the equalized signal at the sampling clock, a comparator circuit for comparing the sampled and held signals with at least four slice levels and converting them into determination level signals having at least quinary values and a phase difference generation circuit for generating a phase difference on the basis of at least the quinary determination level signals from the comparator circuit and outputs of the sample hold circuit. The EPR-4 signals are quinary-determined, and it is therefore possible to measure the phase difference by accurately detecting a peak position or a zero cross position of the signal.