{TAIL ~ A unity gain amplifier} 120 has its input connected to the collector of transistor 108, and furnishes {HEAD ~ VREF} at its output 129 
{ TAIL ~ A unity gain amplifier } 120 has its input connected to the collector of transistor 108 , and furnishes { HEAD ~ VREF } at its output 129
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH