Patent ID: 11923018
Assignee: SK HYNIX INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 11:
12. A method of operating a semiconductor memory device for programming selected memory cells among a plurality of memory cells that are included in a memory cell array, the method comprising a plurality of program loops, each of the plurality of program loops comprising:
determining operation voltages to be used in a current program loop;
applying a program voltage to the selected memory cells by using the determined operation voltages; and
performing a verify operation on the selected memory cells,
wherein the operation voltages include at least one verify voltage and a first under drive voltage that is at a lower voltage level than the verify voltage,
wherein the first under drive voltage and the at least one verify voltage are sequentially applied to a select word line, and
wherein, in determining the operation voltages to be used in the current program loop, the first under drive voltage is determined based on the verify voltage.