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Performance evaluation of run-to-run control methods in semiconductor processes

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3 Author(s)
Chang Zhang ; Dept. of Electr. & Comput. Eng., Maryland Univ., College Park, MD, USA ; Hao Deng ; Baras, J.S.

Run-to-run (RtR) control plays an important role in semiconductor manufacturing processes. In this paper, RtR control methods are classified and evaluated. The set-valued RtR controllers with ellipsoid approximation are compared with two typical RtR controllers: the exponentially weighted moving average (EWMA) controller and the optimizing adaptive quality controller (OAQC) by simulations according to the following criteria: a good RtR controller should be able to compensate for various disturbances, such as small drifts, step disturbances and model errors; moreover, it should be able to deal with bounds, cost requirement and multiple targets that are often encountered in semiconductor processes. Based on our simulation results, suggestions on selection of a proper RtR controller for a semiconductor process are given as conclusions.

Published in:

Control Applications, 2003. CCA 2003. Proceedings of 2003 IEEE Conference on  (Volume:2 )

Date of Conference:

23-25 June 2003

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