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. 08, 2004
Filed:
Nov. 20, 2002
Shoichi Kawamura, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
First and second memory units store reference values and verification values for generating reference voltages and verification voltages of nonvolatile multilevel memory cells. A reference voltage generator generates the reference voltages and the verification voltages according to the reference values and the verification values stored in the first and second memory units. Since the first and second memory units are rewritable, the reference voltages and the verification voltages can be set after the fabrication of the cell memory in accordance with the characteristics of the memory cells which are dependent on variations of fabrication process. A programming test circuit for obtaining the reference voltages and the verification voltages can also be used to set the reference voltages and the verification voltages after the fabrication of the cell memory. Consequently, it is possible to improve the read margins of data read from the memory cells with an enhancement in fabrication yield.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile