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Short channel effect on vth by changing Length and Width.
Theoretically,Length decrease and then vth will also decrease.
But I simulated by hspice. The result is in turn.
Length decrease and then vth increase .
I don't know what's wrong
By the way , I used 90nm TSMC process .
"Reverse Short Channel Effect (RSCE) is now a thing.
All depends on the channel / extensions architecture.
If you "used" TSMC90 then you want to compare the
simulation results to that technology's VT-vs-L data,
not a "qualitative" slide from some presentation (unless
you are sure of model:technology:data consistency).
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