Patent ID: 6144067
Filing Date: 2000-11-07
Classification: H01L

Abstract:
A cell structure for a power MOSFET; said cell structure comprising an elongated base diffusion of one conductivity type in a substrate of the other conductivity type; an elongated source diffusion of the other conductivity type formed within said base diffusion and being substantially coextensive therewith; the area between the outer periphery of said source diffusion and the outer periphery of said base diffusion defining an invertible channel region of substantially constant width; a gate insulation layer overlying at least portions of said invertible channel region; a gate electrode layer overlying said gate insulation layer; said base diffusion having first and second aligned elongated straight sections and a central laterally enlarged section disposed between and continuous with said straight sections; said first and second section being relatively narrow with respect to said laterally enlarged central section for their full length and to the opposite respective ends of said elongated base diffusion; and a source contact connected to said base and source diffusions at said laterally enlarged central section.