Advantageously, {TAIL ~ the lower polysilicon gate level} has both an accurately defined length to provide {HEAD ~ the desired channel length} and a well controlled doping concentration to provide the desired threshold voltage 
Advantageously , { TAIL ~ the lower polysilicon gate level } has both an accurately defined length to provide { HEAD ~ the desired channel length } and a well controlled doping concentration to provide the desired threshold voltage
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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