Patent ID: 7276755

Claim:
A method for manufacturing an integrated circuit, comprising the steps of: providing a semiconductor substrate having first and second active areas that are electrically isolated from each other by a field region; forming a first semiconductor device from the first active area and a second semiconductor device from the second active area; forming a first layer of dielectric material over the first active area and over the field region, and forming the first layer of dielectric material over the second active area and removing the portion of the first layer of dielectric material that is over the second active area; and forming a second layer of dielectric material over the second active area and over the portion of the first layer of dielectric material and over the field region, and forming the second layer of dielectric material over the first active area and removing the portion of the second layer of dielectric material that is over the first active area, wherein the first layer of dielectric material is substantially absent from areas over the second active area and the second layer of dielectric material is substantially absent from areas over the first active area.