Patent ID: 6727977
Filing Date: 2004-04-27
Classification: G03F

Abstract:
A lithographic projection apparatus, comprising:a radiation system constructed and arranged to provide a projection beam of radiation; a support structure constructed and arranged to support a patterning device, the patterning device constructed and arranged to pattern the projection beam according to a desired pattern; a substrate table to hold a substrate; a projection system constructed and arranged to project the patterned beam onto a target portion of the substrate, a first driving device constructed and arranged to move the support structure in a given reference direction substantially parallel to the plane of the patterning device; a second driving device constructed and arranged to move the substrate table parallel to the reference direction so as to be synchronous with the motion of the support structure; a first position measuring device constructed and arranged to determine the momentary position of the patterning device with respect to a fixed reference point; a second position measuring device constructed and arranged to determine the momentary position of the substrate table with respect to a fixed reference point; a position comparator constructed and arranged to compare the measured momentary position of the substrate table with a desired momentary position of the substrate table to generate a position error signal in accordance with a difference between the two positions; and a position error predictor that generates a future position error signal based on one or more previous position error signals; and a position correction device that adjusts the momentary position of the patterning device based upon the future position error signal.