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How transient operating point is calculated in cadence

prashu

 When performing transient analysis with cadence my input is changing and accordingly its operating point should change but when i see its transient operating point than it only show one region throughout the transient analysis please expalin

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  • Hi Andrew,

         here is the analysis statements:

        simulatorOptions options reltol=100e-6 vabstol=1e-6 iabstol=1e-12 temp=27 \
        tnom=27 homotopy=all limit=delta scalem=1.0 scale=1.0 \
        compatible=spice2 gmin=1e-12 rforce=1 maxnotes=5 maxwarns=5 digits=5 \
        cols=80 pivrel=1e-3 ckptclock=1800 sensfile="../psf/sens.output" \
        checklimitdest=psf
    dcOp dc write="spectre.dc" save=all maxiters=150 maxsteps=10000 \
        annotate=status
    capInfo_dc info what=captab where=logfile threshold=0.0 detail=node \
        sort=name
    dcOpInfo info what=oppoint where=rawfile
    tran tran stop=30m errpreset=conservative step=1n ic=dc write="spectre.ic" \
        writefinal="spectre.fc" annotate=status save=all oppoint=rawfile \
        maxiters=5 infoname="capInfo_dc" infotimes=[3m 7m 11m]
    finalTimeOP info what=oppoint where=rawfile
    modelParameter info what=models where=rawfile
    element info what=inst where=rawfile
    outputParameter info what=output where=rawfile
    designParamVals info what=parameters where=rawfile
    primitives info what=primitives where=rawfile
    subckts info what=subckts  where=rawfile
    save MCOLUMNAMP:d MCOLUMNAMP:g Pixel0.MSELECT:d Pixel0.MSELECT:s
    saveOptions options save=all currents=selected 

    could you see it clearly now?

Reply

  • Hi Andrew,

         here is the analysis statements:

        simulatorOptions options reltol=100e-6 vabstol=1e-6 iabstol=1e-12 temp=27 \
        tnom=27 homotopy=all limit=delta scalem=1.0 scale=1.0 \
        compatible=spice2 gmin=1e-12 rforce=1 maxnotes=5 maxwarns=5 digits=5 \
        cols=80 pivrel=1e-3 ckptclock=1800 sensfile="../psf/sens.output" \
        checklimitdest=psf
    dcOp dc write="spectre.dc" save=all maxiters=150 maxsteps=10000 \
        annotate=status
    capInfo_dc info what=captab where=logfile threshold=0.0 detail=node \
        sort=name
    dcOpInfo info what=oppoint where=rawfile
    tran tran stop=30m errpreset=conservative step=1n ic=dc write="spectre.ic" \
        writefinal="spectre.fc" annotate=status save=all oppoint=rawfile \
        maxiters=5 infoname="capInfo_dc" infotimes=[3m 7m 11m]
    finalTimeOP info what=oppoint where=rawfile
    modelParameter info what=models where=rawfile
    element info what=inst where=rawfile
    outputParameter info what=output where=rawfile
    designParamVals info what=parameters where=rawfile
    primitives info what=primitives where=rawfile
    subckts info what=subckts  where=rawfile
    save MCOLUMNAMP:d MCOLUMNAMP:g Pixel0.MSELECT:d Pixel0.MSELECT:s
    saveOptions options save=all currents=selected 

    could you see it clearly now?

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