Patent ID: 6605845
Filing Date: 2003-08-12
Classification: H01L

Abstract:
A field effect transistor, comprising:a semiconductor substrate having a first doped region and a second doped region separated from said first doped region; and a gate electrode overlying a surface of said semiconductor substrate and dimensions of said gate electrode defining a symmetric channel region of said semiconductor substrate and having dimensions of a gate length and a gate height, said first doped region and said second doped region defined by an implantation property, said implantation property of said first doped region having a first implantation characteristic and said implantation property of said second doped region having a different second implantation characteristic, one of said first doped region and said second doped region substantially encroaches a first area of said symmetric channel region beneath said gate electrode, and the other of said first doped region and said second doped region encroaches a second area of said symmetric channel region beneath said gate electrode, the second area of encroachment being less than the first area of encroachment.