Patent ID: 6777779
Filing Date: 2004-08-17
Classification: H01L

Abstract:
A device comprising:a substrate of a first conductivity type; a surface well having a first dopant concentration of a second conductivity type formed in said substrate; source and drain regions positioned within said surface well and separated by a channel region, said source and drain regions having said first conductivity type; a gate positioned over said channel region; a buried well having a second dopant concentration of said second conductivity type, said buried well being positioned in said substrate, below said surface well; and a resistive path, said resistive path being positioned so as to couple a first location in said surface well, below said channel region, to a second location in said surface well, said resistive path having a horizontal length in said buried well, wherein; said horizontal length of said resistive path in said buried well is chosen to provide a resistance between said first location and said second location in said surface well within a specific range of resistance values.