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Accuracy device foundry models with temperature (Read 2469 times)
Visjnoe
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Accuracy device foundry models with temperature
Aug 31st, 2009, 11:01am  
Dear all,

At the moment, I'm measuring a circuit which shows faulty behavior at about 70deg. This circuit has been simulated uptil 125deg.

However, I can reproduce the faulty behavior by putting the temperature (in simulation) to 240deg. This makes me think there's a modeling error in some of the foundry device models...

Does anybody have experience with foundry modeling errors that result in such a large deviation between simulation/measurement, especially over temperature?

Regards
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solidstate
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Re: Accuracy device foundry models with temperature
Reply #1 - Aug 31st, 2009, 12:34pm  
What kind of faulty behavior do you observe? What kind of circuit is this? Which process? Which foundry? It's likely that the error mechanism has a different tipping point for different process corners, or that the presence of device mismatch anticipates the onset..
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Visjnoe
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Re: Accuracy device foundry models with temperature
Reply #2 - Sep 1st, 2009, 12:13am  
Maybe the intention of my question was a bit unclear. I do not want to discuss my specific case in depth, I just wanted to know if other people have encountered similar (or minor) discrepancies between simulation and measurement over temperature (for any given circuit).

Regards
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ywguo
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Re: Accuracy device foundry models with temperature
Reply #3 - Sep 8th, 2009, 12:47am  
Hi Visjone,

Most foundries provide SPICE models which fit the measurement data from -40 degC to 125 degC. I have never designed any circuitry that runs as high as 240 degC. Are you sure the SPICE model covers so high temperature?

Best Regards,
Yawei
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