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