The main differential amplifier is coupled to receive {TAIL ~ the shifted differential voltage signal} and is configured to amplify {HEAD ~ the shifted differential voltage signal} to generate an output voltage signal 
The main differential amplifier is coupled to receive { TAIL ~ the shifted differential voltage signal } and is configured to amplify { HEAD ~ the shifted differential voltage signal } to generate an output voltage signal
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH