This will lower {HEAD ~ the drift region resistance}, leading to a lower rds for {TAIL ~ the device} 
This will lower { HEAD ~ the drift region resistance } , leading to a lower rds for { TAIL ~ the device }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL