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