Semiconductor memory device and method of operating the same

摘要

A semiconductor memory device and a method of operating the same perform a program loop, including a program operation and a program verification operation based on a sub-verification voltage smaller than a target verification voltage and the target verification voltage, to the memory cells until a threshold voltage of the memory cells is greater than the target verification voltage. A positive voltage, supplied to the bit line of the memory cell of which the threshold voltage is higher than the sub-verification voltage, is increased whenever the program operation is performed, and thus a threshold voltage distribution of the memory cells may be improved.

主权项

1. A semiconductor memory device comprising:
memory cells; and a peripheral circuit suitable for performing a program loop, including a program operation and a program verification operation based on a sub-verification voltage, which is smaller than a target verification voltage, and the target verification voltage, to the memory cells until a threshold voltage of the memory cells is greater than the target verification voltage, wherein the peripheral circuit increases a positive voltage, supplied to a bit line of a memory cell of which a threshold voltage is higher than the sub-verification voltage, whenever the program operation is performed.