Patent ID: 6097066
Filing Date: 2000-08-01
Classification: H01L

Abstract:
An electro-static discharge (ESD) protection structure for semiconductor devices, said structure comprising:a plurality of first ring-shaped gate structures formed on a semiconductor wafer;a plurality of first doped regions formed in said wafer in inner areas of said first ring shape structures to act as drains, said plurality of first doped regions including n conductive type ions;a plurality of second doped regions formed in said wafer, said plurality of second doped regions being second ring shape structures;wherein each of said plurality of second doped regions surrounds only one of said plurality of gate structures; andwherein said plurality of second doped regions includes n conductive type ions to serve as sources;a p conductive type ions region formed around said plurality of second doped regions and between thereof, thereby separating said plurality of second doped regions; anda third ring shape structure having n conductive type ions surrounding said p conductive type ions region and being separated from said p conductive type ions region with a space to act as a guard ring.