Patent ID: 11880142
Assignee: KLA CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 10:
11. The self-calibrating overlay metrology system of claim 1, wherein the one or more processors are further configured to execute program instructions causing the one or more processors to:
store the device overlay data, the preliminary device overlay measurements, the assist overlay data, and the self-calibrating assist overlay measurements for the sample and one or more additional samples;
asynchronously retrain the overlay recipe based on the stored device overlay data, the preliminary device overlay measurements, the assist overlay data, and the self-calibrating assist overlay measurements to generate a refreshed overlay recipe; and
update the overlay recipe with the refreshed overlay recipe when a quality metric associated with differences between the preliminary device overlay measurements and the self-calibrating assist overlay measurements on a current sample is below a selected threshold.