Patent ID: 9395408
Filing Date: 2016-07-19
CPC Classification: G01R,H01L

Claim Text:
1. A system for predicting quality of wafers produced by production equipment that includes multiple chambers in each of which multiple wafers are simultaneously processed, comprising: means for measuring process variables of each of the wafers; means for sending the process variables to a central database; a virtual metrology machine implemented on a computer configured for means for sending the predicted quality of each of the wafers to an advanced process controller and the central database; an actual metrology tool for measuring an actual quality of at least one sample of the wafers; means for sending the actual quality of at least one sample of the wafers to the advanced process controller and the virtual metrology machine; means for updating the virtual metrology machine with the actual quality of at least one sample of the wafers; means for determining a feedback control by the advanced process controller; and means for processing the wafers by the production equipment in accordance with the feedback control; wherein for each chamber in which multiple wafers are simultaneously processed, each side of the each chamber processes only one wafer at a time.