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Title: Minimum time control of conductive heating systems for microelectronics processing
Authors: Tay, A. 
Ho, W.K. 
Poh, Y.P.
Keywords: Lithography
Minimum-time control
Temperature control
Issue Date: Nov-2001
Citation: Tay, A., Ho, W.K., Poh, Y.P. (2001-11). Minimum time control of conductive heating systems for microelectronics processing. IEEE Transactions on Semiconductor Manufacturing 14 (4) : 381-386. ScholarBank@NUS Repository.
Abstract: A minimum time control scheme is designed to improve repeatability by minimizing the loading effects induced by the common processing condition of placement of a semiconductor wafer at ambient temperature on a large thermal-mass bake plate at processing temperature. The minimum time control strategy provides an optimal solution for minimizing the worst case deviation from a nominal temperature set-point during the load disturbance condition. This results in a predictive controller that performs a predetermined heating sequence prior to the arrival of the wafer as part of the resulting feedforward/feedback strategy to eliminate the load disturbance. The controller is easy to design and implement and makes it more suitable for online implementation such as automatic online tuning of a feedforward controller. Experimental results depict an order-of-magnitude improvement in the settling time and the integral-square temperature error between the optimal predictive controller and a feedback controller for a typical load disturbance.
Source Title: IEEE Transactions on Semiconductor Manufacturing
ISSN: 08946507
DOI: 10.1109/66.964325
Appears in Collections:Staff Publications

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