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:
Dec. 09, 2003
Filed:
Oct. 18, 2002
Akira Yamamoto, Kawasaki, JP;
Shoichiro Kawashima, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
The present invention provides a data storage device that has high reliability and less power consumption, and a data read-out circuit and a data read-out method employed in the data storage device. This data storage device of the present invention includes a bit line and a memory cell (a ferroelectric capacitor) connected to the bit line. This data storage device characteristically further includes: a capacitor that accumulates electric charge supplied; a negative voltage generating circuit, a p-channel MOS transistor T , a Vth generating circuit , and a feedback circuit that transfer electric charge outputted onto the bit line BL at the time of data read-out to the capacitor; and a sense amplifier circuit that amplifies a voltage generated by the electric charge accumulated by the capacitor, so as to read out the data from the memory cell.