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:
Nov. 06, 2007
Filed:
Jul. 31, 2006
Tetsuo Ashizawa, Kawasaki, JP;
Tetsuo Ashizawa, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An electric fuse is formed over a semiconductor substrate, the electric fuse being broken when a current flows therethrough. A breaker transistor is formed in a first surface layer of the semiconductor substrate of a first conductivity type, the breaker transistor including a source region, a drain region and a gate electrode. The source and drain regions sandwiches a channel region. The gate electrode controls a conduction state between the source and drain regions. The drain region is connected to one end of the electric fuse. A breaker pad is connected to the end of the electric fuse to supply a fusing current to the electric fuse. A back-bias pad applies a fixed voltage to the first surface layer independently from both a power supply voltage and a ground potential. A fuse information read circuit reads a breakdown/non-breakdown state of the electric fuse.