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Parametric Analysis

TMishra

Hi,

I am new to the SKILL Language and Cadence in general. I tried running a parametric analysis on a circuit using the script below :

ocnWaveformTool( 'awd )
simulator( 'spectre )
//design(     )
//resultsDir(  )
modelFile(
//some other model files
    '("../NMOS_Operating_Pt_Data/saveop.scs" "")
)
analysis('dc ?saveOppoint t  )
desVar(      "Vgs" 2.5    )
desVar(      "Vds" 02.5    )
desVar(      "L" 0.6    )
desVar(      "Vsb" 2.5    )
envOption(
    'firstRun  t
)
temp( 27 )
paramAnalysis("L" ?values '(0.6 0.62 0.64 0.66 0.68 0.70 0.72 0.74 0.76 0.78 0.80 0.82 0.84 0.86 0.88 0.90 0.92 0.94 0.96 0.98 1 )
  paramAnalysis("Vgs" ?values '(0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75 3 3.25 3.5 3.75 4 4.25 4.5 4.75 5 )
    paramAnalysis("Vds" ?values '(0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75 3 3.25 3.5 3.75 4 4.25 4.5 4.75 5 )
    paramAnalysis("Vsb" ?values '(0 -0.5 -1 -1.5 -2 -2.5 -3 -3.5 -4 -4.5 -5 )
))))
paramRun()
ocnPrint(?output "ron_ncond.csv"
?numberNotation 'scientific
getData("MN0:gmoverid" .....)

// something like this for more parameters
)

I am using Cadence 2005

There are multiple issues :

a. Can I just save the parameters that I need instead of saving the entire operating point ?

b. What I want from the simulator is a 4-D matrix which I can then manipulate in MATLAB, which I don't get from my current setup. Can somebody please guide me ?

I can reduce the number of parameters but that doesn't solve the other issues.

Thank you,

Tejas

  • One thing you could do (which might be more efficient) is to generate the entire matrix, but then use the spectre toolbox for Matlab (included in the MMSIM stream) to read the results directly into Matlab. I'd recommend using a recent MMSIM version (e.g. MMSIM14.1) together with a recent version of Matlab (at least R2012a onwards). Run `cds_root`/tools/bin/cdnshelp and search for "Matlab" to find out more.

    Regards,

    Andrew.

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