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:
Jan. 29, 2013
Filed:
Dec. 11, 2008
Tomohito Tsushima, Toyko, JP;
Tsunenori Shiimoto, Kanagawa, JP;
Shuichiro Yasuda, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A storage device capable of reducing a number of cycles necessary for a verify at a time of multi-bit recording is provided. An initial value of a potential difference VGS between a gate and a source of a switching transistor at the time of the verify is set to a value varied based on a resistance value level of multi-bit information. In the case of recording 2 bits when '01' is the information, an initial value VGSis set to be smaller than VGS=1.7 V corresponding to the target resistance value level '01', and when “00” is the information, a value is set to be lower than VGS=2.2 V corresponding to the target resistance value level “00” and higher than the above-described VGS. This can reduce the number of cycles necessary for the verify process.