a third N channel MOS transistor connected between {HEAD ~ the other conductive terminal} of said ;{TAIL ~ third P channel MOS transistor} and the ground potential, 
of
a third N channel MOS transistor connected between { HEAD ~ the other conductive terminal } of said ; { TAIL ~ third P channel MOS transistor } and the ground potential ,
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH