Patent ID: 7868423

Claim:
A structure, comprising: a substrate doped to have a certain type of conductivity; a first implant region disposed at least partially next to the substrate, wherein the first implant region is doped to have a type of conductivity opposite to that of the substrate; at least one second implant region disposed at least one of within the first implant region and adjacent to the first implant region, wherein the at least one second implant region is doped to have a type of conductivity opposite to that of the first implant region; an isolated well region disposed next to at least one of the at least one second implant region, wherein the isolated well region is doped to have the same conductivity as that of the at least one second implant region; a pair of well regions disposed on either side of the isolated well region and next to the isolated well region, wherein the pair of well regions are doped to have the same type of conductivity as that of the first implant region, wherein the pair of well regions electrically contact the first implant region, and wherein the isolated well region is not in electrical contact with the first implant region and is isolated therefrom and is isolated from the substrate; a third well region doped to have a certain type of conductivity and a fourth well region doped to have a certain type of conductivity; and a fifth well region disposed next to the third well region, wherein the fifth well region is doped to have a type of conductivity that is the same as the conductivity of the at least one second implant region and opposite to the type of conductivity of the third well region, and wherein the fifth well region is disposed next to at least one of the at least one second implant region wherein the fifth well region has a built-in potential difference with respect to the first implant region and is isolated therefrom.