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:
Feb. 23, 1999
Filed:
Jan. 02, 1997
Dae Jeong Kim, Seoul, KR;
LG Semicon Co., Ltd., Cheongju, KR;
Abstract
A digital delay locked loop (DLL) includes a phase detector for outputting a comparing signal by comparing a system clock signal with a chip clock signal, a shift register for sequentially shifting data bit values in both the directions in accordance with the comparing signal, a phase delay unit for delaying and outputting the system clock signal in accordance with each bit value of the shift register, a domain selecting controller for detecting an overflow or an underflow condition of the shift register and outputting a domain selection controlling signal, and a domain selector for adjusting the phase of a driving signal from one region comprising 0.degree..about.180.degree. and to another area comprising 180.degree..about.360.degree. and carrying out a domain transition whenever an overflow or an underflow condition is generated when the phase reaches a boundary region of the two domains.