Memory device and operation method thereof

A memory device comprising:

• a memory array;
• and
• a memory controller coupled to the memory array,
• wherein the memory controller is configured to:
• selecting a target memory cell and at least one replicated memory cell belonging to the same memory string;
• replicating a target weight value written into the target memory cell to the at least one replicated memory cell, wherein the target memory cell and the at least one replicated memory cell store the target weight value;
• and
• in response to a command of reading or computing on the target memory cell received by the memory device, performing reading or computing on the target memory cell and the at least one replicated memory cell simultaneously.