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. 18, 2009
Filed:
Jun. 22, 2007
Applicant:
Tatsuya Matano, Tokyo, JP;
Inventor:
Tatsuya Matano, Tokyo, JP;
Assignee:
Elpida Memory, Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A semiconductor memory device includes transistors that supply a higher write potential and a lower write potential to a sense amplifier, respectively, an overdrive transistor that supplies an overdrive potential to the sense amplifier, and a control circuit that changes a gate-source voltage of the overdrive transistor step by step. By raising a potential of one of paired bit lines to the overdrive potential not suddenly but step by step, an influence of a potential increase on the other bit line via a parasitic capacity is lessened and a malfunction caused by data inversion is prevented.