Patent ID: 7563679

Claim:
A method of fabricating a peripheral memory device comprising a low voltage device and a high voltage device portions of a substrate of the peripheral device, wherein the low voltage and high voltage device portions are separated by an insulation barrier, the method comprising: depositing on the peripheral device a dielectric , the dielectric comprising a nitride material and an oxide material, wherein the oxide material is in physical contact with the substrate of the peripheral device and with a top surface of the insulation barrier, and the oxide material separates the substrate of the peripheral device and the top surface of the insulation barrier from the nitride material; overlaying the low voltage device portion with a first mask; after said overlaying the device portion with the first mask, removing, from areas not overlaid with the first mask, a first portion of the dielectric covering a first portion of the insulation barrier to expose a top surface of the high voltage device portion of the substrate; after said removing of said first portion, removing the first mask; growing a first oxide on the high voltage device portion; overlaying the high voltage device portion with a second mask; after said overlaying the device portion with the second mask, removing, from areas not overlaid with the second mask, a second portion of the dielectric covering a second portion of the insulation barrier to expose a top surface of the low voltage device portion of the substrate; after said removing of said second portion, removing the second mask; and growing a second oxide on the low and high voltage device portions.