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