Andrew Beckett
Senior Fellow
Offline
Life, don't talk to me about Life...
Posts: 1742
Bracknell, UK
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The trouble is that at small geometries, it is no longer simple!
That's why complex models like bsim3v3 and bsim4 have come about, in order to describe the behaviour properly. It's not really the model's fault that it is hard to hand calculate at small geometry; it's the physics.
Really those text book equations have only been useful for understanding relative relationships between parameters (for example, if you double this current, that voltage will change by this factor). Trying to use them to solve your circuit by hand has long been difficult (even if you were using a 3um process, say).
Probably not the answer you were looking for, but thought I should say it.
Regards,
Andrew.
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