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:
Aug. 28, 2012
Filed:
Jan. 07, 2010
Seokhun Hyun, Yongin-si, KR;
Junghwan Choi, Hwaseong-si, KR;
Seokhun Hyun, Yongin-si, KR;
Junghwan Choi, Hwaseong-si, KR;
Samsung Electronics Co., Ltd., Gyeonggi-do, KR;
Abstract
A delay locked loop (DLL) circuit includes an analog DLL core and a digital DLL core. The analog DLL core receives an input clock signal of a first operating frequency. The digital DLL core receives an input clock signal of a second operating frequency equal to or lower than the first frequency. The analog and digital DLL cores operate selectively. The DLL core also includes a selection circuit configured to select one of the first and second DLL cores. The selection circuit may operate in response to a detection signal from a frequency detector which detects the frequency of the input clock signal. The selection circuit may also operate in response to a column address strobe writing latency signal that indicates frequency information of the input clock signal.