A feedback path is employed to follow {TAIL ~ voltage} applied to {HEAD ~ an output pad} through substrate bias voltage 
A feedback path is employed to follow { TAIL ~ voltage } applied to { HEAD ~ an output pad } through substrate bias voltage
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH