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