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What is the exactly mean of 'vdsat' in SPECTRE

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vdsat definition

May be it's an old question, but i think it's important. As we know, BSIM3 spice model does not give a clear definition for 'vdsat', and vdsat is always not equal vgs-vth.
And so, which can be taken as 'criterion' in out circuit design.
 

vdsat definition spectre

Well... vdsat = vgs-vth is a very basic first order expression. There are may factors in your spice model that are used by spectre or any other simulator. it is just to give u a rough hand analysis.

So u could probably look at the spice model and equations for vdsat....
 
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