Soft program method in a non-volatile memory device

Details Soft program method in a non-volatile memory device Soft program method in a non-volatile memory device

2007-12-28

2010-11-23

Le, Vu A (Department: 2824)

Static information storage and retrieval

Floating gate

Particular biasing

C365S185180

Reexamination Certificate

active

07839692

ABSTRACT:
A soft program method in a non-volatile memory device for performing a soft program step so as to improve threshold voltage distribution of an erased cell is disclosed. The soft program method in a non-volatile memory device includes performing a soft program for increasing threshold voltages of memory cells by a given level, wherein an erase operation is performed about the memory cells, performing a verifying operation for verifying whether or not a cell programmed to a voltage more than a verifying voltage is existed in each of cell strings, and performing repeatedly the soft program until it is verified that whole cell strings have one or more cell programmed to the voltage more than the verifying voltage.

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