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:
Apr. 16, 1996
Filed:
Feb. 27, 1995
Takashi Mihara, Saitama, JP;
Hitoshi Watanabe, Tokyo, JP;
Hiroyuki Yoshimori, Kanagawa, JP;
Carlos A Paz de Araujo, Colorado Springs, CO (US);
Larry D McMillan, Colorado Springs, CO (US);
Symetrix Corporation, Colorado Springs, CO (US);
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A method and apparatus for programming ferroelectric memory cells which reduces polarizability fatigue effects of switching polarization of the ferroelectric devices associated with the memory cells such as ferroelectric capacitors and transistors. Alteration of the pulse width duty cycle associated with signals used to switch ferroelectric device polarization is shown to reduce polarizability fatigue of the ferroelectric material thereby increasing the useful life of ferroelectric memory cells. Methods and apparatus for producing a signal pulse duty cycle in the range 2-30% is disclosed and shown to improve the useful life of the ferroelectric material.