Patent ID: 11862244
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 8:
9. A method, comprising:
determining initial programming curves of a plurality of phase change memory cells;
determining a target programming curve for the plurality of phase change memory cells based on the initial programming curves; and
modulating a first phase change memory cell of the plurality of phase change memory cells by applying a first stressing procedure on the first phase change memory cell until a modulated programming curve of the first phase change memory cell meets the target programming curve,
wherein the determining the target programming curve includes:
applying a test stressing procedure on each of the plurality of phase change memory cells;
measuring test programming curves of the plurality of phase change memory cells after the test stressing procedure has been applied; and
determining the target programming curve based on the test programming curves and the initial programming curves of the plurality of phase change memory cells; and
wherein the test stressing procedure is configured to determine initial shift directions from the initial programming curves of the plurality of phase change memory cells, the initial shift directions of the initial programming curves of the plurality of phase change memory cells including a right-shift direction and a left-shift direction.