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:
Dec. 02, 2008
Filed:
Aug. 11, 2006
Hiroyasu Nagai, Osaka, JP;
Masahiro Toki, Shiga, JP;
Kenji Misumi, Kyoto, JP;
Hideto Kotani, Osaka, JP;
Hiroyasu Nagai, Osaka, JP;
Masahiro Toki, Shiga, JP;
Kenji Misumi, Kyoto, JP;
Hideto Kotani, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
In a nonvolatile memory cell having a trap layer, programming or erasing is made in a sequence of first charge injection with a given wait time being secured and second charge injection executed after the first charge injection. Surrounding charge that deteriorates the data retention characteristic is reduced by use of initial variation occurring immediately after programming (charge loss phenomenon due to binding of injected charge with the surrounding charge in an extremely short time), and then the charge loss due to the initial variation is compensated, to thereby improve the data retention characteristic.