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