Patent ID: 8685827

Claim:
A method for manufacturing a semiconductor device, comprising: forming a first gate stack portion on a substrate, the first gate stack portion including a first gate oxide layer and a first polysilicon layer on the first gate oxide layer; forming a second gate stack portion on the substrate, the second gate stack portion including a second gate oxide layer and a second polysilicon layer on the second gate oxide layer; forming a resistor portion on the substrate, the resistor portion including a third gate oxide layer and a third polysilicon layer on the third gate oxide layer, wherein the resistor portion is disposed at a substantially same height from an upper surface of the substrate as the first and the second gate stack portion; covering the resistor portion with a photoresist without covering the first and the second gate stack portion; removing respective first portions of the first and second polysilicon layers from the first and second gate stack portions; removing the photoresist from the resistor portion; and after removing the photoresist from the resistor portion, removing respective remaining portions of the first and second polysilicon layers from the first and second gate stack portions.