help on second order effect!

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kibby

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if the function of mos fet in saturation region is used:
i=1/2*ucw/l*(vgs-vth)^2
which ignore the second order effect;
to analyse the character of gm''(the second derivative of gm) of a simple full differential amplifier,then is the result helpful for design? or it is unreasonable?
why?
thx~
 

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