When I simulate the mc it shows a warning "Warning from spectre during Monte Carlo analysis `mc1'.
mc1: Attempt to run Monte Carlo analysis with process and mismatch variations, but no process variations were specified in statistics block.". How can one specifiy the statistics for monte carlo simulation?
I usually do Monte Carlo in Microsoft Excel where I specify all parameters manually. That way I can fully understand and debug any problems that arise when running simulations. If that helps, then I attach two short articles explaining how to do this in Excel 2003 and 2007.
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thanks for the reply.. you are talking about monte carlo simulation for equity if i m not wrong. Actually i need to know the montecarlo simulation in cadence tool for finding out the mismatches in CMOS comparator.
Certainly you can give values to statistical variables, however by-default several foundry provides their own monte-carlo simulation file. In UMC, normally those model files comes with a name called MC. To define your own variables/values, please go through the cadence help (help->cadence documentation->search for monte carlo) .
I have required the "standard deviation" (strictly the rms) of the parameters I am evaluating to be less than 20% fir a single "run."
Hi Shilpi,
I faced this problem too. I fixed it but still have other problems to fix. According to Cadence support, To run monte carlo analysis in spectre, you need a "statistics" block in your netlist which tells spectre which parameters you want to vary and how.
This is typically in a "stats" section in the model file. Please check also if there is a section "stat" or "mc" in the model file.
Or you can create a separate analysis code that analyses your output.
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