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