Transistors 320 and 324 comprise the main power switches in {HEAD ~ the boost mode} of {TAIL ~ operation} while transistor 308 is always on and transistor 312 is always off 
of
Transistors 320 and 324 comprise the main power switches in { HEAD ~ the boost mode } of { TAIL ~ operation } while transistor 308 is always on and transistor 312 is always off
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH