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:
Jun. 02, 2009
Filed:
Aug. 15, 2007
Kensuke Matsufuji, Fuchu, JP;
Hiroshi Ito, Yokohama, JP;
Kensuke Matsufuji, Fuchu, JP;
Hiroshi Ito, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A write voltage source is capable of applying a write voltage, which is a high voltage. An antifuse is connected at one end to the write voltage source and has a resistance irreversibly variable based on the write voltage. A sense node is connectable to the other end of the antifuse. A sense amp compares the potential on the sense node with a reference potential. The sense node is used to accumulate charge thereon. To control the potential difference placed between both ends of the antifuse, a third transistor is provided having one end connected to the sense node. The third transistor is provided with a precharge voltage source on the other end, and a precharge controller operative to on/off control the gate.