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Montecarlo analysis - RF Cafe Forums
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Seth
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Post subject: Montecarlo analysis
Posted: Sun Nov 02, 2008 10:19 pm
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Joined: Sun Nov 02, 2008
10:16 pm Posts: 3 |
My question is on Montecarlo and Worst case analysis.
I know one can use a commercial CAD simulator to
run montecarlo simulations on a design if one knows
the tolerances of parts used. But vendors of active
devices typically don't provide statistical models
for their devices. What sort of tolerance levels
(of model parameters) does one assume for the active
device? I have looked up the literature
for publications on this topic and I have'nt found
much. Any help on this issue would be much appreciated.
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IR |
Post subject:
Posted: Thu Nov 06, 2008 5:51 pm
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Site Admin |
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Joined: Mon Jun 27, 2005
2:02 pm Posts: 423 Location: Germany
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Hello Seth, You raise here an interesting
question. It is true that manufacturers of active
devices don't provide the tolearnces. These tolerances
would be the deviations of the device intrinsic
parameters like intrinsic capacitances, inductances,
equivalent noise sources etc, which are very hard
to model and which are process-dependant.
Basically the S-parmaeters of an active RF device
are being extracted from the non-linear model provided
by the manufacturer. A deviation from the S-paramaters
e.g. lot to lot or temperature dependant will be
dervided by a deviation in the device internal parmeters.
For a given device, a given X% deviation in S21
(gain), is caused by a given Y% deviation in several
intrinsic paramaters of the non-linear model. You
can ask the device's manufacturer what is for example
the expected deviation in S21 from lot to lot, and
according to that to change the parameters of the
model, which mostly affect the device's gain, by
this to get an idea about the estimateded tolerances
of the device's parametrs. Hope this helps!
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Seth |
Post subject: Re: Montecarlo analysis
Posted: Sun Mar 22, 2009 6:17 am
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Joined: Sun Nov 02, 2008
10:16 pm Posts: 3 |
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IR |
Post subject: Re: Montecarlo analysis
Posted: Sun Mar 22, 2009 6:50 am
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Site Admin |
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Joined: Mon Jun 27, 2005
2:02 pm Posts: 423 Location: Germany
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By the way, I have seen in the last days that in
some Mixed-Signal simulators which are capable to
analyze Spice models, there is a possibility of
Monte-Carlo analysis with paramater sweep. I was
not aware to the recent developments in this area,
but more and more manufacturers are providing now
Macromodels Spice models for their IC's (like DC-DC
converters, broadband amplifier) and also transistor.
If I compare it to 2-3 years ago, these models and
simulation capabilities were not available then.
_________________ Best regards, -
IR
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Posted 11/12/2012
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