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MODEL-BASED ASSIST FEATURE PLACEMENT USING AN INVERSE IMAGING APPROACH
MODEL-BASED ASSIST FEATURE PLACEMENT USING AN INVERSE IMAGING APPROACH
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机译：基于逆向成像方法的基于模型的辅助特征定位
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摘要
Some embodiments provide techniques and systems to identify locations in a target mask layout for placing assist features. During operation, an embodiment can determine a spatial sampling frequency to sample the target mask layout, wherein sampling the target mask layout at the spatial sampling frequency prevents spatial aliasing in a gradient of a cost function which is used for computing an inverse mask field. Next, the system can generate a grayscale image by sampling the target mask layout at the spatial sampling frequency. The system can then compute the inverse mask field by iteratively modifying the grayscale image. The system can use the gradient of the cost function to guide the iterative modification process. Next, the system can filter the inverse mask field using a morphological operator, and use the filtered inverse mask field to identify assist feature locations in the target mask layout.
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