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:
Jun. 16, 2009
Filed:
Jul. 19, 2007
Applicant:
Seok-bo Shim, Gyeonggi-do, KR;
Inventor:
Seok-Bo Shim, Gyeonggi-do, KR;
Assignee:
Hynix Semiconductor Inc., Gyeonggi-do, KR;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H03K 3/017 (2006.01);
U.S. Cl.
CPC ...
Abstract
A delay locked loop circuit for a semiconductor memory apparatus includes a duty cycle correcting part that corrects and outputs duty cycles of internal clocks. A clock pulse width detecting part detects a pulse width of an external clock and outputs a pulse width detecting signal. A driving part divides a phase of the output of the duty cycle correcting part, adjusts a pulse width of at least one of two signals, which are obtained by dividing the phase, in accordance with the pulse width detecting signal, and outputs the two signals as delay locked loop clocks.