Patent ID: 7352439
Filing Date: 2008-04-01
Classification: G03F

Abstract:
1. A lithography system comprising: a performance prediction unit, configured to predict a performance criterion of the formation of a pattern on a substrate by the lithography system based on an operating condition of the lithography system; an exposure unit, configured to expose a pattern of radiation on the substrate; a performance measurement unit, configured to measure a performance criterion of the formation of the pattern on the substrate by the lithography system, the measured performance criterion corresponding to the predicted performance criterion; a comparison unit, configured to compare the predicted performance criterion with the corresponding measured performance criterion; and a process controller configured to determine, based upon a difference in the predicted performance criterion and the corresponding measured performance criterion as determined by the comparison unit, which, if any, sub-system of the lithography system is not functioning in an expected manner, and configured to control the lithography system, wherein subsequent control of the lithography system is regulated by the difference in the predicted performance criterion and the corresponding measured performance criterion determined by the comparison unit.