Patent ID: 8354728

Claim:
A semiconductor device comprising: a source region formed in a substrate, the substrate having a surface; a drain region formed in the substrate; a gate electrode formed above the surface of the substrate, the gate electrode being positioned between the source region and the drain region along a first direction which is a direction along the surface, the gate electrode having a first edge in a second direction which is a direction along the surface, the second direction intersects orthogonally with the first direction, the first edge extending along the first direction; an impurity layer formed in the substrate, the impurity layer surrounding the gate electrode, the source region and the drain region in the plan view, the impurity layer having a ring shape in the plan view; a layer formed above the impurity layer, the layer including a second edge in the second direction, the second edge extending along the first direction, the layer having a ring shape in the plan view; and a first wiring layer formed above at least a part of a first region of the substrate, the first region being located between the first edge and the second edge in the plan view.