Patent ID: 11919121
Assignee: APPLIED MATERIALS, INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 12:
13. A polishing system, comprising:
a platen to support a polishing pad;
a carrier head to hold a substrate in contact with the polishing pad;
a motor to generate relative motion between the carrier head and the polishing pad;
an in-situ monitoring system to, for each region of a plurality of regions on the substrate being polished, generate a sequence of characterizing values for the region; and
a controller configured to
receive from the in-situ monitoring system, for each region of a plurality of regions on the substrate, the sequence of characterizing values for the region,
for each region, determine a polishing rate for the region, and
calculate an adjustment for at least one processing parameter, wherein calculation of the adjustment includes minimizing a cost function that includes, for each region, a difference between a current characterizing value or an expected characterizing value at an expected endpoint time and a target characterizing value for the region, and wherein optimization of the cost function is subject to at least one constraint.