Patent ID: 6785871
Filing Date: 2004-08-31
Classification: G06F,G06T

Abstract:
A method of finding an optically periodic structure in a cell layer of an integrated circuit design comprising:receiving as input a physical representation of a cell layer of an integrated circuit design; finding reference coordinates of a selected portion of the cell layer from the physical representation of the cell layer; selecting an initial element located nearest to the reference coordinates wherein the initial element includes boundaries that determine optical properties of the cell layer; constructing a base structure that includes the initial element and a number of elements in the physical representation of the cell layer; generating a replica of the base structure at an X-offset and a Y-offset to fill the entire selected portion so that for each element in each replica of the base structure there is an identical element at identical coordinates in the physical representation of the cell layer; and generating as output the base structure defining the optically periodic structure in the selected portion of the cell layer.