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:
Nov. 15, 2011
Filed:
Sep. 08, 2009
Tomohiro Kobayashi, Kawasaki, JP;
Tomohiro Kobayashi, Kawasaki, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A semiconductor memory device includes a memory cell array provided with a main memory cell array including a plurality of memory cells, and a dummy column including a plurality of dummy memory cells, a dummy readout current control section configured to control a current value of a dummy readout current of the dummy memory cell in such a manner that the current value becomes between the current values of the readout currents in first and second states of the memory cell, and a sense section provided with a sense amplifier configured to receive a readout current in one of the first and second states, or dummy readout current as an input, comparing these currents with each other, and outputting the currents.