Patent ID: 11969855
Assignee: APPLIED MATERIALS, INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B  G | IPC B

Claim 5:
6. A polishing system, comprising:
a platen to support a polishing pad;
a carrier head to hold a substrate in contact with the polishing pad during polishing;
an in-situ monitoring system configured to generate a signal from a sensor that monitors the substrate during polishing, the signal including a sequence of measured values; and
a controller configured to
receive, during polishing of the substrate, the signal from the in-situ monitoring system,
filter the signal to generate a filtered signal, the filtered signal including a sequence of adjusted values, wherein the controller is configured to filter the signal by
modeling a plurality of periodic disturbances at a plurality of different frequencies,
modeling an underlying signal, and
applying a linear prediction filter to the modelled underlying signal with the modelled plurality of periodic disturbances to generate the filtered signal representing the underlying signal with the periodic disturbances filtered out, and

at least one of halt polishing or adjust a polishing rate based on the filtered signal.