Patent ID: 7719064
Filing Date: 2010-05-18
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate; a first well of a first conductivity type near a surface of the semiconductor substrate; a second well of a second conductivity type near the surface of the semiconductor substrate, the first well and the second well being separated by a first distance; a transistor having a first source/drain region formed in the first well and a second source/drain region formed in the second well, the first and second source/drain regions being separated from the semiconductor substrate underlying the first well and the second well by a doped region having a conductivity type opposite that of the source/drain region, the doped region comprising either the first well, the second well, or a deep well subjacent to the first well or the second well and having a conductivity type opposite the first and second source/drain regions; a bulk contact region of the first conductivity type in the first well, the bulk contact region having a higher dopant concentration than the first well; and an isolation structure in the first well between the bulk contact region and the first source/drain region.