Patent ID: 6492689
Filing Date: 2002-12-10
Classification: H01L

Abstract:
A semiconductor device comprising:a semiconductor substrate of a first conduction type; a transistor created in an active area enclosed by a periphery area on said semiconductor substrate; a plurality of field limiting rings which are provided on a main surface of said semiconductor substrate in said periphery area, enclose said active area in a multiplexed state and are each made of a semiconductor layer of a second conductor type opposite to said first conduction type; a field insulating film covering the peripheral area of the main surface of said semiconductor substrate; a resistor element which is created on said field insulation film, being extended in a direction from an inner side of said field limiting rings to an outer side of said field limiting rings and whose start edge is connected to an electrode having a low electric potential of said transistor and an end edge is connected to an electrode having a high electric potential of said transistor, said end edge being positioned on said outer side of said group of said field limiting rings; an interlayer insulation film covering said resistor element; and a field plate created on said interlayer film at a location corresponding to said field limiting ring on the outermost circumference and electrically connected to said field limiting ring on said outermost circumference, wherein the value of resistance per unit length of said resistor element along a virtual line connecting a start edge and an end edge of said resistor element varies from position to position.