Patent ID: 7560200

Claim:
A mask data generation method in which optical simulation is performed on a dual gate including a first gate portion doped with an impurity of a first conductivity type and a second gate portion doped with an impurity of a second conductivity type for correcting design data including said dual gate, comprising the steps of: (a) calculating a first dimension difference of said first gate portion between a resist dimension obtained in lithography and a dimension obtained after dryetch following the lithography; (b) calculating a second dimension difference of said second gate portion between a resist dimension obtained in the lithography and a dimension obtained after the dryetch; (c) calculating a difference between said first dimension difference and said second dimension difference; (d) correcting said first gate portion or said second gate portion in said design data by using said difference calculated in the step (c); and (e) generating mask data by executing the optical simulation on said design data having been corrected by using said difference.