Patent ID: 6664608
Filing Date: 2003-12-16
Classification: H01L

Abstract:
A semiconductor device comprising:a bulk material of a first conductivity comprising a front side and a back side, wherein said back side of said bulk material is supplied with a first potential; first wells of said first conductivity formed in said front side of said bulk material, wherein at least one of said first wells is supplied with said first potential; second wells of said first conductivity formed in said front side of said bulk material, wherein at least one of said second wells is supplied with a second potential which is different than said first potential; third wells of a second conductivity formed in said front side of said bulk material; and a first buried layer of said second conductivity extending between said back side of said bulk material and said first, second and third wells, said first buried layer comprising at least one opening therein to electrically connect said bulk material with said at least one of said first wells supplied with said first potential; wherein said at least one of said second wells supplied with said second potential is electrically isolated from said at least one opening of said first buried layer by at least one of said third wells.