Patent ID: 6610449
Filing Date: 2003-08-26
Classification: G03F

Abstract:
A method, comprising:identifying features of a pattern for a layer to be formed using a photolithographic mask, the pattern consisting of a first line segment, a second line segment, and a third line segment, said first, second, and third line segments having respective first and second sides, and in which the first and second line segments intersect the third line segment on the first side of the third line segment at respective first and second intersections; and laying out phase shift regions for the identified features to produce a phase shift mask, the phase shift mask having a single phase shift region between the first and second line segments, and complementary second and third phase shift regions extending adjacent to the first and second line segments on sides opposite to said single phase shift region, and a fourth phase shift region having the same phase as said single phase shift region on the second side of said third line.