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. 26, 1992
Filed:
Dec. 21, 1989
Applicant:
Inventors:
Bhum C Lee, Daejeon Chungnam, KR;
Kwon C Park, Seo-gu Daejeon, KR;
Assignees:
Electronics and Telecommunications Research Institute, Daejeon, KR;
Korea Telecommunication Authority, Seoul, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ;
U.S. Cl.
CPC ...
307514 ; 307527 ; 307471 ; 307479 ; 328133 ; 375120 ;
Abstract
A frequency and phase detection circuit in an NRZ bit synchronous system by simultaneously retiming an NRZ input with an in-phase clock and an inverse-phase clock, respectively. A first frequency and phase difference is extracted by supplying the retimed NRZ with the in-phase clock and the delay-compensated NRZ input to an exclusive OR-gate. A second frequency and phase difference is extracted by supplying the retimed NRZ with the inverse-phase clock and the retimed NRZ with the in-phase clock to another exclusive OR-gate.