Patent ID: 8937364
Filing Date: 2015-01-20
Classification: H01L,H03K

Abstract:
1. A high voltage semiconductor device, comprising: a lightly doped semiconductor substrate having a first type of conductivity; a first well region having a second type of conductivity and formed over the lightly doped semiconductor substrate; a second well region in the first well region and having the first type of conductivity, wherein the second well region is a discontinuous elliptical ring having at least two discontinuities in a top view; an elliptical ring-shaped first insulating structure over and partially embedded in the first well region; a gate structure partially over the first insulating structure and partially over the second well region, wherein the gate structure is a discontinuous elliptical ring having at least two openings in a top view; a drain region in a center of the first well region across the first insulating structure from the gate structure; and a source region in the second well region disposed on a side of the gate structure opposite from the drain region wherein the source region is a discontinuous elliptical ring having at least two discontinuities in a top view and wherein the at least two discontinuities in the second well region, the at least two openings in the gate structure and the at least two discontinuities in the source region are congruent.