Patent ID: 8039897
Filing Date: 2011-10-18
Classification: H01L

Abstract:
1. A lateral MOSFET comprising: a heavily doped substrate of a first conductivity type; a first epitaxial layer of said first conductivity type laying over said substrate; a diffused tub of a second conductivity type opposite to said first conductivity type formed in said second epitaxial layer; an active gate electrode on a gate dielectric which is on a major surface of said second epitaxial layer; a source region of said first conductivity type in said first epitaxial layer extending to said major surface of said second epitaxial layer and self aligned with a first edge of said active gate electrode; a lightly doped drain of said first conductivity type in said second epitaxial layer extending to said major surface of said second epitaxial layer and self aligned with a second edge of said active gate electrode on an opposite side of said active gate electrode from said first edge; a sinker region of said first conductivity type on the same side of said active gate electrode as said lightly dope drain and spaced apart from said active gate electrode, said sinker region extending from said major surface of said second epitaxial layer to a depth substantially equal to the depth of said first and second epitaxial layers; a non-active gate electrode attached to said major surface of said second epitaxial layer for defining the lateral edge of the sinker region between the major surface of the second epitaxial layer and the first epitaxial layer and the lateral edge of the lightly doped drain region, said non-active gate electrode on the same side of said active gate electrode as said lightly dope diffusion and spaced apart from said active gate electrode, and substantially between said lightly doped diffusion and said portion of said sinker in said major surface of said second epitaxial layer.