Patent ID: 9659920
Date: 2017-05-23
CPC Classifications: G03F,G06F,H01L,Y02P

Claim:
1. A device arrangement, comprising; an array of unit cells comprising a first feature density; a first region of dummy unit cells disposed at a border of the array of unit cells and comprising a width approximately equal to a cell size of a unit cell, and wherein the first region of dummy unit cells further comprises the first feature density; a second region of first graded density dummy cells disposed at a border of the first region of dummy unit cells and comprising the width, wherein the second region of first graded density dummy cells further comprises a second feature density that is less than the first feature density by approximately a density gradient value; and a third region of second graded density dummy cells disposed at a border of the second region of first graded density dummy cells and comprising the width, wherein the third region of second graded density dummy cells further comprises a third feature density that is less than the second feature density by approximately the density gradient value.