Patent ID: 11865664
Assignee: APPLIED MATERIALS, INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B  H | IPC B  H

Claim 15:
16. A polishing system, comprising:
a platen to support a polishing pad;
a carrier head to hold a substrate;
a motor to generate relative motion between the platen and the carrier head;
an in-situ eddy current monitoring system to monitor the substrate during polishing of the substrate; and
a controller configured to
receive from the in-situ eddy current monitoring system a sequence of characterizing values for a substrate during polishing of the substrate;
execute simultaneously on the controller a plurality of software instances of a profile control algorithm, each software instance performing the same profile control algorithm, the plurality of software instances including a first instance and a second instance having different values for a control parameter, wherein the first instance of the profile control algorithm receives the sequence of characterizing values during an initial time period, and the second instance of the profile control algorithm receives the sequence of characterizing values during the initial time period and a subsequent time period;
for the initial time period, control one or more polishing parameters using the first instance of the profile control algorithm based on the sequence of characterizing values received during the initial time period;
detect exposure of an underlying layer based on the sequence of characterizing values from the in-situ eddy current monitoring system; and
for the subsequent time period after detecting the exposure of the underlying layer, control one or more polishing parameters using the second instance of the profile control algorithm based on the sequence of characterizing values received during the initial time period and the subsequent time period.