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