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:
Oct. 20, 2009
Filed:
Apr. 03, 2007
Koji Inoue, Ikoma, JP;
Koji Inoue, Ikoma, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A nonvolatile semiconductor memory device comprises a memory cell array in which memory cells are arranged in a row and column direction, a circuit for applying a first voltage to a selected bit line, a circuit for applying a second voltage to unselected bit lines and word lines, a circuit for reading a current flowing in a selected memory cell, a voltage suppressor circuit for suppressing fluctuation of the second voltage with respect to each word line and bit line provided in the circuit for applying the second voltage, and a second voltage control circuit for applying the first voltage to the selected bit line and a dummy second voltage to the unselected bit lines and the word lines during the preset period and controlling the voltage suppressor circuit during a reading period so that the second voltage may fluctuate in a fluctuation direction of the first voltage.