Semiconductor memory device and method of operating the same
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United States of America Patent
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Sep 3, 2013
Grant Date -
Nov 3, 2011
app pub date -
Apr 28, 2011
filing date -
Apr 29, 2010
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Abstract
A semiconductor memory device includes a memory string coupled to a bit line, a page buffer configured to sense a sensing current of the bit line in an erase verification operation or a program verification operation, and a sensing control circuit configured to differently set a level of the sensing current in the erase verification operation and the program verification operation in order to sense the threshold voltage level of a selected memory cell of the memory string.
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