Patent ID: 6421820
Filing Date: 2002-07-16
Classification: G03F

Abstract:
A method of manufacturing a semiconductor device, the method comprising:designing a layout of a plurality of original shapes that are to be incorporated into the semiconductor device; for at least some of the plurality of original shapes, measuring the width of the original shape and a distance to at least one neighboring shape; generating a modified shape by moving edges of the original shape based on the width and distance measurements; for each of the modified shapes, measuring a distance between the modified shape and at least one neighboring shape; determining a normalized space count by dividing the measured distance by a normalized space constant and taking an integer value; determining a correct number of assist features by subtracting one from the normalized space count; determining a normalized space by dividing the measured distance by the normalized space count; modifying the layout by adding the correct number of assist features in a space between the modified shape and the neighboring shape; producing a photomask based upon the modified layout; and using the photomask to produce a semiconductor device.