Thus, during {HEAD ~ a portion}, Δ, of each period P, there is a dead zone during which both transistors Q1 and {TAIL ~ Q2} are in non conducting condition 
Thus , during { HEAD ~ a portion } , Δ , of each period P , there is a dead zone during which both transistors Q1 and { TAIL ~ Q2 } are in non conducting condition
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH