Patent ID: 7352436

Claim:
A lithographic apparatus comprising: a projection system configured to project a patterned radiation beam onto a target portion of the substrate, said substrate being supported on a substrate table, wherein said lithographic apparatus comprises a control system configured to control a position of said substrate table, said control system comprising: a first detection device configured to generate a projection system position signal representative of a position of the projection system, a second detection device configured to generate a projection system feed-forward signal, a comparative unit configured to generate a servo error signal by subtracting a signal representative of an actual substrate table position from a substrate table position reference signal and adding said projection system position signal, a control unit configured to generate a first control signal on the basis of said servo error signal, an addition unit configured to generate a second control signal by adding said projection system feed-forward signal and said first control signal, and an actuator unit configured to actuate said substrate table to a desired substrate table position on the basis of said second control signal, wherein said control system further comprises a projection system position signal filter unit configured to filter said projection system position signal before adding said projection system position signal to the reference substrate table position signal.