Patent ID: 8021933
Filing Date: 2011-09-20
Classification: H01L

Abstract:
1. A method of forming an integrated circuit, the method comprising: forming first structures arranged in a first portion of the integrated circuit; and forming second structures arranged in a second portion of the integrated circuit, the second structures being arranged denser than the first structures; wherein the first and second structures are formed by lithography processes that comprise: transferring a first pattern to the first and second portions using a first photomask with first pattern openings in both first and second regions respectively corresponding to the first and second portions of the integrated circuit; and transferring a second pattern to the first and second portions using a second photomask with second pattern openings in both first and second regions respectively corresponding to the first and second portions of the integrated circuit, the second pattern differing from the first pattern, wherein the first structures are formed in the first portion of the integrated circuit via a superposition of the first and second patterns, and the second structures are formed in the second portion of the integrated circuit via a superposition of the first and second patterns.