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the threshold voltage is only a function of the manufacturing technology
and the applied body bias VSB. The threshold can therefore be considered as a constant
over all NMOS (PMOS) transistors in a design.
In ans provided by bestwobin, the equation of Vt is derived for two dimentional mos view. If Vt equation is found by considering all effects, it will contain the terms W & L. For this check out BSIM3 parameters equations.
Well Vt is directly proportional to L and inversly proportional to W.
phutane said is more emphasize the manufacturing process,and i consider little about that.
In the formula,VT0 is an empirical parameter,which is the threshold voltage for VSB = 0, and is mostly a function of the manufacturing process.there is more details in <Digital Integrated Circuits>,Jan M. Rabaey.