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. 02, 2011
Filed:
Jun. 29, 2004
Applicants:
Se-jun Kim, Ichon-shi, KR;
Sang-hoon Hong, Ichon-shi, KR;
Jae-bum Ko, Ichon-shi, KR;
Inventors:
Assignee:
Hynix Semiconductor Inc., Ichon-shi, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C 7/06 (2006.01);
U.S. Cl.
CPC ...
Abstract
A semiconductor memory device, which performs a refresh operation, includes: a temperature sensing unit for measuring temperature and for generating a temperature controlled voltage and a reference current based on the measured temperature; an analog-digital conversion unit for converting the temperature controlled voltage to an N-bit digital signal; a refresh control unit for generating a refresh signal in response to the N-bit digital signal, wherein, a period of the refresh signal is controlled based on the N-bit digital signal.