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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> Monte carlo analysis in spectre https://designers-guide.org/forum/YaBB.pl?num=1098168836 Message started by kayathi on Oct 18th, 2004, 11:53pm |
Title: Monte carlo analysis in spectre Post by kayathi on Oct 18th, 2004, 11:53pm I have done wafer level characterization for transistor mismatches. I want to put these numbers into spectre for circuit evaluation purposes.The problem is I am having hard time figuring out how to use monte carlo analysis in spectre. I have gone through the document on this in designer's guide, but still the procedure for doing this is a little obscure. THe documentation in spectre's user guide isn't that helpful. Can somebody tell me where i can find a better documentation or a tutorial of some sort. Thanks Kayathi |
Title: Re: Monte carlo analysis in spectre Post by ywguo on Oct 19th, 2004, 5:53am Hi, If you know anything about monte carlo analysis with model parameter distribution using SPICE, please put light on me, too. I always wonder how to analyze the offset voltage accurately using SPICE. :) Thanks Yawei |
Title: Re: Monte carlo analysis in spectre Post by Andre on Nov 15th, 2004, 4:34pm This should be very straightforward. You might want to specify the output in the Analog Artist first (e.g. for a current mirror with a gain of 1 you can specify current_mismatch = Iout - Iin). Then you open the MC tool and you should see your output right there. Specify the number of runs and the mismatch / process / both. Then run the simulation. The MC tools is only a wrapper around the artist simulation that you already specified. Spectre requires an initial run in Artist to get the mean values right. The deviation (process / mismatch) should be specified in the model files. Run the simulation and look at the results (e.g. histogram for the current_mismatch). Andre |
Title: Re: Monte carlo analysis in spectre Post by kayathi on Nov 16th, 2004, 3:31pm Thanks Andre The problem I have is specifing the deviation in the model files. If you have a sample deviation file that would be a lot helpful. Thanks Kayathi |
Title: Re: Monte carlo analysis in spectre Post by Andrew Beckett on Nov 21st, 2004, 10:13pm Did you read this: http://www.designers.guide.com/Modeling/montecarlo.pdf That would probably answer your questions. Regards, Andrew. |
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