Mayank
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hi, Plz check if all your transistorss including your tail current source is in saturtation/sub-Vt region of Operation(MOS) as you intended them to be. Also check if the vds drop across 1/gm resistance of diode connected load is leaving enough vds across input MOS for it to be in saturation. And yeah, post your schematic with op points.
regards, Mayank.
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