SEMICONDUCTOR MEMORY DEVICE AND OPERATING METHOD THEREOF
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United States of America Patent
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Sep 23, 2016
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Aug 18, 2014
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Abstract
A method of operating a semiconductor memory device includes performing a first program operation to simultaneously increase threshold voltages of memory cells having different target levels to sub-levels lower than the different target levels, verifying the memory cells by using different verify voltages, respectively, performing a second program operation to divide the threshold voltages of the memory cells, and performing a third program operation to increase the threshold voltages of the memory cells to the different target levels, respectively.
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