Patent ID: 8334579

Claim:
An integrated circuit device comprising: a semiconductor substrate having a top surface and a bottom surface, the semiconductor substrate being a first conductivity type; a lightly doped diffusion region disposed in the semiconductor substrate, the lightly doped diffusion region being doped with a second conductivity type, the second conductivity type being different than the first conductivity type; a first well of the first conductivity type extending from the top surface into the semiconductor substrate, the first well surrounding the lightly doped diffusion region; a second well of the second conductivity type disposed in the semiconductor substrate, the second well disposed below the lightly doped diffusion region and partially abutting a bottom portion of the first well; a third well of the second conductivity type adjacent to and in physical contact with the lightly doped diffusion region; and a conductive layer disposed adjacent to the lightly doped diffusion region, wherein a Schottky region is formed at a junction of the conductive layer and the lightly doped diffusion region.