A semiconductor substrate is provided which includes a first well region having a first conductivity type, {HEAD ~ a second well region} having the first conductivity type, a first gate structure overlying the first well region and {TAIL ~ the second gate structure} overlying the second well region 
A semiconductor substrate is provided which includes a first well region having a first conductivity type , { HEAD ~ a second well region } having the first conductivity type , a first gate structure overlying the first well region and { TAIL ~ the second gate structure } overlying the second well region
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH