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:
Jan. 09, 2001
Filed:
Oct. 08, 1998
Applicant:
Inventors:
Assignee:
STMicroelectronics S.r.l., Agrate Brianza, IT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C 1/300 ;
U.S. Cl.
CPC ...
G11C 1/300 ;
Abstract
In order to optimize writing of the cell, the latter is written in a condition of equilibrium between an injection current I,and the displacement current C,V,. In this way, during writing, the voltage of the floating gate region V,remains constant, as does the drain current and the rise in the threshold voltage. In particular, both for programming and for soft-writing after erasure, the substrate of the cell is biased at a negative voltage V,with respect to the source region, and the control gate region of the cell receives a ramp voltage V,with a selected predetermined inclination V,satisfying an equilibrium condition V,<I,/C,.