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NBTI simulation tutorial using ELDO

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dyan83

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Hi all... I'm newbie here...
Anyone could help me to get tutorial for NBTI simulation using ELDO tool...
I'm going to start a project on NBTI and I'm a bit blur about it...

Please help me..... ;-(
 

erikl

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dyan83 said:
... I'm going to start a project on NBTI and I'm a bit blur about it... ;-(
Do you have transistor models which include NBTI behavior? You need at least level 49 or 53 SPICE models (BSIM3v3 & higher). The simulation itself is NOT the problem.

I just can give you 2 papers on NBTI mechanisms and on on-wafer evaluation:

erikl
 

elpajuo

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Ok I am also trying to do some nbti and HCI simulation

Using bsim latest models bsim4 and hspice or smartspice.

which are the parameters to simulate the NBTI? Just do transient analysis with the applied negative bias ?
I haven't been able to find much information on how to do a stress test
 

erikl

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Ok I am also trying to do some nbti and HCI simulation
E.g. C@dence' UltraSim can do this: View attachment UltraSim.pdf

Using bsim latest models bsim4 and hspice or smartspice. which are the parameters to simulate the NBTI?
I didn't find any info about NBTI parameters in the BSIM4 description.
BSIM3, however, can use NBTI parameters: BSIM3-NBTI-parameters.png

Just do transient analysis with the applied negative bias ?
DC analysis for very long times (months, years), or for seconds ... minutes at very high temperatures (300 .. 400 °C).
 

elpajuo

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THanks a lot, I will try it
 

dick_freebird

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Any theory based model is suspect. Trapping and detrapping
behaviors are very lot-processing-variable. NBTI has fast,
recoverable and slow, nonrecoverable components to it.
I doubt that you want to take the data needed to fit the
envelope let alone fine-guess circuit response with NBTI in
play. Plus you would need each transistor to comprehend
its bias history uniquely, based on some other DC or transient
simulation.

In my world you don't play footsie with NBTI and hot carrier,
you stay the hell away from it.
 

erikl

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In my world you don't play footsie with NBTI and hot carrier, you stay the hell away from it.
Fabs/foundries unfortunately cannot stay (the hell) away from these effects, they monitor (not simulate) them, s. the PDF paper above.
 

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