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I want to derivative in dc analysis.
I used probe to derivative log(Ids).
.probe dc deri_ids par='deriv(Ids)'
and then
I also used waveview function to derivative log(Ids)
but the result is different .
The waveview function is correct . probe is wrong .
I don't know why I can't use .probe...
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 .
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