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Short Channel Effect on Threshold Voltage by changing Length

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DaisukeHuang

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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 .

螢幕快照 2017-07-21 下午1.34.53.png

Vth Variation.png
 

"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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