Patent ID: 8399924

Claim:
An integrated circuit, comprising: a semiconductor substrate, said substrate having a first conductivity type; a first extended drain metal oxide semiconductor (MOS) transistor, said first MOS transistor including: a first source/channel active area; a first drain contact active area, said first drain contact active area being disposed opposite from said first source/channel active area; a first body region in said substrate at said first source/channel active area, said first body region having said first conductivity type; a first channel region in said body region, said first channel region being disposed at a top surface of said substrate in said first source/channel active area; a first gate dielectric layer disposed on said substrate over said first channel region; a first gate disposed on said first gate dielectric layer; a first source region disposed in said first source/channel active area adjacent to said first gate opposite from said first drain contact active area, said first source region having a second conductivity type opposite from said first conductivity type; and a first drain drift region disposed in said substrate, such that: said first drain drift region has said second conductivity type; said first drain drift region extends from said first drain contact active area to said first source/channel active area; said first drain drift region abuts said first channel region; and said first drain drift region includes a first plurality of lateral doping striations in said first source/channel active area and extending a portion of a distance to said first drain contact active area, said first plurality of lateral doping striations being parallel to said top surface of said substrate, said first plurality of lateral doping striations having said second conductivity type, so that an average doping density of said first drain drift region at said first source/channel active area is at least 25 percent less than an average doping density of said first drain drift region at said first drain contact active area.