Disclosed is {HEAD ~ a differential amplifier} including {TAIL ~ an emitter follower pair}, a first differential pair, and a main differential amplifier 
Disclosed is { HEAD ~ a differential amplifier } including { TAIL ~ an emitter follower pair } , a first differential pair , and a main differential amplifier
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH