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System, masks, and methods for photomasks optimized with approximate and accurate merit functions
System, masks, and methods for photomasks optimized with approximate and accurate merit functions
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机译:利用近似和精确的优值函数进行优化的光掩模的系统,掩模和方法
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摘要
Photomask patterns are represented using contours defined by mask functions. Given target pattern, contours are optimized such that defined photomask, when used in photolithographic process, prints wafer pattern faithful to target pattern. Optimization utilizes “merit function” for encoding aspects of photolithographic process, preferences relating to resulting pattern (e.g. restriction to rectilinear patterns), robustness against process variations, as well as restrictions imposed relating to practical and economic manufacturability of photomasks. An accurate, slower merit function may be used to determine adjustment parameters for a faster, approximate merit function. The faster merit function may be used for iteration and adjusted based on the adjustment parameters.
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