Patent ID: 9035380
Filing Date: 2015-05-19
Classification: H01L

Abstract:
1. An integrated circuit, comprising: a high-voltage well having a first doping type; a first doped region and a second doped region embedded in the high-voltage well, the first and second doped regions having a second doping type and spaced apart by a channel in the high-voltage well; a source region in the first doped region and a drain region in the second doped region, each of the source and drain regions having the second doping type and more heavily doped than the first and second doped regions; first and second isolation regions, the first isolation region spaced apart from the source region and the second isolation region spaced apart from the drain region; and first and second resistance protection oxide rings over the high-voltage well, each of the first and second resistance protection oxide rings forming a ring surrounding respective ones of the source region and the drain region.