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. 06, 2009
Filed:
Mar. 26, 2008
Junichi Yamada, Kanagawa, JP;
Junichi Yamada, Kanagawa, JP;
NEC Electronics Corporation, Kanagawa, JP;
Abstract
A non-volatile semiconductor memory device is provided with: a first memory cell including a floating gate transistor; a first bitline connected to a diffusion layer which is used as a source of the first memory cell; a second bitline connected to a diffusion layer which is used as a drain of the first memory cell; a first reference cell including a floating gate transistor; a third bitline electrically isolated from the first bitline and connected to a diffusion layer which is used as a source of the first reference cell; a read circuit identifying data stored in the first memory cell in response to a memory cell signal received from the first memory cell through the second bitline and a reference signal received from the first reference cell through the fourth bitline; and a bitline level controller controlling a voltage level of the third bitline.