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[SOLVED] subtreshold leakage and supply voltage

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farzaneh_2561

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Hi there,
I have a question, How does subtreshold leakage change with Supply Voltage and also technology?
Thanks
 

Sub threshold leakage is basically the leakage when the gate voltage is less than threshold voltage.

So, when the supply is less than Vt , we dont expect any current. But, due to charges there is a possibility of current flow from Source to drain and we term it as Sub threshold leakage

Technology :
If the library is Low Vt then the sub threshold effect will be more compared to HVT library.
 
Thanks for the reply. I'm familiar with the concept. I guess I didn't describe my question very well. If we lower the VDD (but not under the threshold voltage) does it affect subthreshold voltage?
 

Yes, I hope you are talking about the drain voltage variation.
If the Drain voltage is more, more Diffussion area will be present in Drain region and hence more leakage.

Eg : Vdrain = 5V will have more leakage than Vdrain = 3V keeping Vt=1V .
 
\[Ids=Is\frac{W}{L}{e}^{\frac{Vgs}{Vt}}(1-{e}^{\frac{-Vds}{Vt}}+\frac{Vds}{Va})\]

Use this equation to estimate how threshold voltage varies with supply voltage.
 

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