Design parameter (W, L, I) scaling in analog CMOS design

This video discusses performance trade-offs in analog design under impedance scaling, W-only scaling and W & L scaling

[@vinaybhaskarchandratre7762]

lemda is a guess work ?. Only Franco's book estimates it with a empirical (almost) formula, Baker's has two values small & large L based lemda , rest of other books do algebra of symbols !. what are your thoughts on lemda estimation when one does design trade-off ?