Patent ID: 6187483
Filing Date: 2001-02-13
Classification: G03F

Abstract:
A method of determining an optimal mask fabrication process, comprising the steps of:fabricating a first mask pattern on a mask using a first mask fabrication process, wherein the first mask pattern provides a pattern on a substrate which approximates an ideal pattern;performing a mathematical transform on the first mask pattern, wherein the mathematical transform provides a representation of the first mask pattern as a first sum or product of functions;fabricating a second mask pattern on a mask using a second mask fabrication process, wherein the second mask pattern provides a pattern on a substrate which approximates the ideal pattern;performing a mathematical transform on the second mask pattern, wherein the mathematical transform provides a representation of the second mask pattern as a second sum or product of functions;obtaining a metric for the transformed mask patterns, wherein the metric is based upon a capability of a pattern transfer system which will utilize the masks employing the first and second mask patterns, respectively; andselecting the first mask fabrication process or the second mask fabrication process based upon an application of the metric to the first and second sum or product of functions, thereby selecting the one of the first or second mask fabrication process that provides for a better mask pattern which most closely approximates the ideal mask pattern.