In low supply voltage applications, voltage drop due to {TAIL ~ transistors} of amplifier circuitry can be significant and can affect {HEAD ~ possible range} of output voltage swing 
In low supply voltage applications , voltage drop due to { TAIL ~ transistors } of amplifier circuitry can be significant and can affect { HEAD ~ possible range } of output voltage swing
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH