Patent ID: 7511348

Claim:
A semiconductor integrated circuit apparatus, comprising: a semiconductor substrate; a first transistor, including a first well formed in said semiconductor substrate, and a first gate structure disposed on said semiconductor substrate and extending away from said semiconductor substrate, said first gate structure including a first gate electrode overlying said first well, and said first gate structure further including a stressor that produces a first stress in said first well, said first gate electrode disposed between said stressor and said semiconductor substrate; a second transistor, including a second well formed in said semiconductor substrate, and a second gate structure disposed on said semiconductor substrate and extending away from said semiconductor substrate, said second gate structure including a second gate electrode having a uniform composition overlying said second well, and said second gate electrode extending further from said semiconductor substrate than said first gate electrode; and a layer of material disposed in contact with said first gate structure and said second gate structure, said layer of material producing a second stress in said second well, the second stress having an opposite type of stress than the first stress.