each of {HEAD ~ gate electrodes} of said {TAIL ~ first P channel MOS transistor} and said second N channel MOS transistor receives said mode trigger signal 
each of { HEAD ~ gate electrodes } of said { TAIL ~ first P channel MOS transistor } and said second N channel MOS transistor receives said mode trigger signal
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH