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:
Sep. 17, 2002
Filed:
Sep. 15, 2000
Applicant:
Inventor:
Junichi Yamada, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C 1/122 ;
U.S. Cl.
CPC ...
G11C 1/122 ;
Abstract
A ferroelectric memory device has a ferroelectric capacitor comprising a ferroelectric thin film and a first capacitive electrode and a second capacitive electrode which sandwich the ferroelectric thin film therebetween. The ferroelectric memory device is operable in a wide range of allowable power supply voltages such that it can operate at a low power supply voltage. The ferroelectric thin film is formed such that a coercive voltage thereof is smaller than a reduced voltage applied between the first capacitive electrode and the second capacitive electrode and generated by reducing an external power supply voltage supplied in a predetermined voltage range.