The differential amplifier 110 amplifies voltage difference between the inputted reference voltage and the voltage at the node N7 and provides {HEAD ~ the amplified voltage} to {TAIL ~ the node N6} 
to
The differential amplifier 110 amplifies voltage difference between the inputted reference voltage and the voltage at the node N7 and provides { HEAD ~ the amplified voltage } to { TAIL ~ the node N6 }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL