Patent ID: 7241662

Claim:
A method of fabricating a peripheral device comprising a first device and a second device, wherein the first and second devices are separated by an insulation barrier having a top surface with a uniform height, wherein the insulation barrier comprises a field oxide, the method comprising: depositing on the peripheral device a dielectric comprising at least one dielectric layer that is in physical contact with the peripheral device; overlaying the first device with a first mask; removing the dielectric from the second device where the first mask is not overlaid such that the height of the top surface of the insulation barrier remains substantially uniform; removing the first mask; growing a first oxide layer on the second device; overlaying the second device with a second mask; removing the dielectric from the first device where the second mask is not overlaid such that the height of the top surface of the insulation barrier remains substantially uniform; removing the second mask; growing a second oxide layer on the first and second devices; and exposing a trench in the field oxide to remove a hedge.