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:
Jan. 11, 2011
Filed:
Dec. 29, 2006
Applicant:
Cheul Hee Koo, Kyoungki-do, KR;
Inventor:
Cheul Hee Koo, Kyoungki-do, KR;
Assignee:
Hynix Semiconductor Inc., Kyoungki-do, KR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K 3/017 (2006.01);
U.S. Cl.
CPC ...
Abstract
A semiconductor memory device, which includes a clock tree circuit for correcting the duty cycle of a clock. The device sets a beta ratio to cause a constant duty cycle by using a reference clock having a constant duty cycle in a test mode, and then applies the set beta ratio to a DLL clock outputted from a delay-locked loop. Then, when the duty cycle of the DLL clock, to which the beta ratio has been applied, is not constant, the duty cycle of the DLL clock is corrected in the delay-locked loop.