Non-volatile electrically alterable semiconductor memory for...

G - Physics – 11 – C

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G11C 7/00 (2006.01) G11C 11/56 (2006.01) G11C 27/00 (2006.01)

Patent

CA 2201366

Methods and apparatus for achieving analog storage in a non-volatile memory array. The array consists of memory cells that utilize Fowler-Nordheim tunneling for erasure and hot electron injection for programming. Writing into a cell is performed by an initial erasure followed by a controlled sequence of program operations during which the cell is programmed in small increments. The stored voltage is read after each program step and when the voltage reads back from the cell is equal or just beyond the desired analog level, the sequence of program steps is terminated. The read condition for the cell applies a positive voltage to the drain or common line and a positive voltage to the control gate. The source is connected through a load device to a negative (ground) supply. The output from the cell is the actual voltage that exists at the source node.

Techniques et appareillage permettant un stockage analogique en mémoire rémanente. La mémoire se compose de cellules de mémoire faisant appel à l'effet tunnel de Fowler-Nordheim pour l'effacement et à l'injection d'électrons chauds pour la programmation. L'écriture dans une cellule se fait par effacement initial suivi d'une séquence contrôlée d'opérations du programme au cours desquelles la cellule est programmée par petits incréments. La tension emmagasinée est lue après chaque pas du programme. Lorsque la tension du courant revenant de la cellule est égale ou légèrement supérieure à la valeur analogique souhaitée, la séquence de pas du programme est terminée. L'état de lecture de la cellule entraîne l'application d'une tension positive au drain ou à la ligne commune et d'une tension également positive à la grille de commande. La source est reliée à une alimentation négative (terre) par l'intermédiaire d'un élément de charge. La tension de sortie de la cellule est la tension réelle s'appliquant au noeud de la source.

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