Patent ID: 6867100

Claim:
A method of producing a double diffused semiconductor device to minimize performance impact of end cap regions, comprising the steps of: providing a moat region; forming an implanted region at least partially in said moat region by implanting a least a first and second dopant species into said moat region wherein said implanted region comprises straight regions and concave regions; diffusing said at least first and second dopant species from said straight regions and said concave regions of said implanted region into a first unimplanted region that lies adjacent to said implanted region; forming a first transistor source or drain region in said unimplanted region; forming a second transistor source or drain region in said implanted region; forming a transistor gate between said first source or drain region and said second source or drain region that overlies said straight regions and said concave regions; and wherein the concave regions of said implanted regions are formed over an oxide region formed adjacent to said moat region.