Patent ID: 7315052
Filing Date: 2008-01-01
Classification: H01L

Abstract:
1. A power transistor formed on a semiconductor substrate and including a lateral array of polysilicon lines separated by alternating source and drain regions, the power transistor comprising: one or more elongated body contact diffusion regions formed in areas of the source regions not receiving the source diffusion, each elongated body contact diffusion region having a rectangular shape with a width that extends in parallel with the edges of the two adjacent polysilicon lines and a length that extends perpendicular to the edges of the two adjacent polysilicon lines and having a dopant type opposite to the dopant type of the source region; and one or more body pickup contacts, each body pickup contact formed only over a respective body contact diffusion region, wherein the body contact diffusion regions are formed in a fabrication process using ion implantation of dopants of a first type through a body diffusion mask, each body contact diffusion region defined by an exposed area in the body diffusion mask having a drawn area that overlaps the respective two adjacent polysilicon lines.