Acceleration feedback in a lithographic tool

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Acceleration feedback increases the mass of a system as experienced by disturbance forces. A high bandwidth is required to avoid phase lag in the position control loop. This article splits the acceleration controller in a forward and backward path to create the original process behavior for the position controller, removing the high-bandwidth requirement. Digital controller effects, incorporation of plant dynamics, and implications for setpoint feedforward are discussed. The method is implemented in the stage of a lithographic scanner operating at nanometer accuracy in semiconductor manufacturing. It is shown that the low-frequent disturbance rejection is considerably improved without impacting higher-frequency performance. --------------------------------------------------------------------------------
Original languageEnglish
Pages (from-to)453-464
Number of pages12
JournalControl Engineering Practice
Issue number4
Publication statusPublished - 2012


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