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threshold voltage question

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vhdl00

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i run hspice simulations recently, found that the threshold voltage is different for same device, i mean other than body effect, is there any other factors affect threshold voltage?
 

holddreams

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in which case ?
do you use the same corner? that is ,typical typical corner?ff corner?
in different corner,the vth will change a little.
 

sunking

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it depond on the voltage and current,too.
 

hrkhari

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Hi:

I deep submicron process the Vth decreases due to the increase of Vds and this effect is known as drain induced barrier lowering (DIBL).

Rgds
 

ambreesh

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Usually foundy specifies the vth depending on w and L of devices you are going to use.
If you go through the BSIM3v3 manual, you would find that the threshold voltage is a function of loads of other parameters.
And the value you would observe in the model file is for hand calculations when you do design.
A question what percentage variation did you observe.
Holberg in his book has mentioned on how one should characterise a mos device, kindly go through that, it would be great help to you.
Hope it helps.
 

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