{HEAD ~ Technique} for improving {TAIL ~ propagation delay} of low voltage to high voltage level shifters 
for improving
{ HEAD ~ Technique } for improving { TAIL ~ propagation delay } of low voltage to high voltage level shifters
HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH