Lithography occupies an important position in the development of integrated circuits. As a core component - the wafer stage is a high accuracy, real-time and large travel control important equipment, which has a significant impact on lithography alignment accuracy and exposure quality. The complexity of the wafer stage control and the real-time feedback of synchronization errors are the practical needs in high quality communication. As a general-purpose communication device—USB in various fields has a wide application, and its reliability has been sufficiently validated. In this paper, USB is used as data transmission device to achieve entire communication process. Grating data in FPGA is processed and transferred into host computer, and then it is used to do error analysis. Meanwhile the feedback of grating data from FPGA is aimed to promote the stage orientation precision. The host computer transfers data and custom command through USB to monitor the state of stage motion and guarantees the high-precision control.
Lithography is one of the most important and complicated key equipments for the Integrated Circuit (IC) manufacture.
The ultra-precision stage is the important subsystem of lithography and its motion performance impacts directly on the
resolution and throughput of lithography. In this paper, a robust and high response speed control strategy for dual-stage
manipulator is presented. The coarse/fine dual-stage uses the linear motor driven coarse (macro) positioning stage and
the Lorenz plane motor driven fine (micro) positioning stage. By adopting merits of both coarse and fine actuator, a
desirable system having the capacity of large workspace with high resolution of motion is enabled. The feedback
controller is constructed so that the fine stage tracks the coarse stage errors. The controller is robustly designed as the
master-slave control strategy. In addition, the position decoupling which translates fine stage’s machine position
command into its actual position command are discussed and, as a result, the overall coarse/fine dual-stage servo system
exhibits robust and high response speed performance. Simulation shows that master-slave controller can much decrease
positioning error and improve response speed of the coarse/fine dual-stage system.
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