US Patent 7902020 Semiconductor device and method of manufacturing the same

A semiconductor device includes a first conductivity-type deep well formed in a substrate, a plurality of device isolation layers formed in the substrate in which the first conductivity-type deep well is formed, a second conductivity-type well formed on a portion of the first conductivity-type deep well between two of the device isolation layers, a first gate pattern formed over a portion of the second conductivity-type well, a second gate pattern formed over one of the device isolation layers, a source region formed in an upper surface of the second conductivity-type well to adjoin a first side of the first gate pattern, a first drain region formed to include the interface between an upper surface of the second conductivity-type well adjoining a second side of the first gate pattern and an upper surface of the first conductivity-type deep well adjoining the second side of the first gate pattern, and a second drain region formed in an upper surface of the first conductivity-type deep well to be spaced from the second conductivity-type well.