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:
Feb. 20, 2001
Filed:
Mar. 16, 1999
Sumio Tanaka, Tokyo, JP;
Daisaburo Takashima, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A ferroelectric memory device includes a plate line driving circuit, dummy plate line driving circuit, constant voltage generator and variable voltage generating circuit. The plate line driving circuit pulse-drives a plate line associated with a memory cell selected at the time of data readout. The dummy plate line driving circuit pulse-drives a dummy plate line associated with a dummy cell connected to a reference bit line which makes a complementary pair with a bit line connected to the selected memory cell. The constant voltage generator generates a voltage which does not depend on an external power supply voltage and the temperature and is kept substantially constant and applies the voltage to the plate line driving circuit as a power supply voltage. The variable voltage generating circuit generates a plurality of substantially constant voltages which do not depend on an external power supply voltage and the temperature and applies a voltage selected from the plurality of voltage levels according to the high level or low level of the bit line to the dummy plate line driving circuit as a power supply voltage.