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Sweeping Vth vs L

Arjun RP

Hi all,

I am Arjun, Graduate student pursuing IC Design. I am trying to sweep the Vth of transistor with respect to its length. I saved a file with .scs extension and with the content save M0:all. I selected DC analysis and in the sweep i selected component parameter and transistor M0 where i selected its length "l". I also included the .scs file into model library. But when i run the simulation i am getting a error as given below. 

ERROR (SFE-430) : 'dc' : Sweeping the parameters of a subcircuit instance ('M0') is currently not supported. Please use the spectre sweep instead.

Spectre terminated prematurely due to fatal error.

 What should i do to overcome this error ? Please help me 

Parents

  • This is what i get from simulation-->netlist-->display. I dont know how to show include file as mysave rather than mysave.scs. Also uploaded the sceenshot

     

     

     // Generated for: spectre

    // Generated on: Aug  6 19:09:59 2014

    // Design library name: Vref

    // Design cell name: test

    // Design view name: schematic

    simulator lang=spectre

    global 0

    include "/home/palaniapy13/mysave.scs"

    include "models.scs"

    parameters length=1

     

    // Library name: Vref

    // Cell name: test

    // View name: schematic

    M0 (net6 net3 0 0) nlvtlp w=0.135 l=length nfing=1 mult=1 srcefirst=1 \

            ngcon=1 mismatch=1 lpe=0 dnoise_mdev=0 dmu_mdev=0 dvt_mdev=0

    V4 (net3 0) vsource dc=1 type=dc

    V5 (net6 0) vsource dc=1 type=dc

    simulatorOptions options reltol=1e-3 vabstol=1e-6 iabstol=1e-12 temp=27 \

        tnom=27 scalem=1.0 scale=1.0 gmin=1e-12 rforce=1 maxnotes=5 maxwarns=5 \

        digits=5 cols=80 pivrel=1e-3 sensfile="../psf/sens.output" \

        checklimitdest=psf 

    dcOp dc write="spectre.dc" maxiters=150 maxsteps=10000 annotate=status

    dcOpInfo info what=oppoint where=rawfile

    dc dc param=length start=0.5 stop=10 lin=10 oppoint=rawfile maxiters=150 \

        maxsteps=10000 annotate=status

    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

    saveOptions options save=allpub subcktprobelvl=2


     

Reply

  • This is what i get from simulation-->netlist-->display. I dont know how to show include file as mysave rather than mysave.scs. Also uploaded the sceenshot

     

     

     // Generated for: spectre

    // Generated on: Aug  6 19:09:59 2014

    // Design library name: Vref

    // Design cell name: test

    // Design view name: schematic

    simulator lang=spectre

    global 0

    include "/home/palaniapy13/mysave.scs"

    include "models.scs"

    parameters length=1

     

    // Library name: Vref

    // Cell name: test

    // View name: schematic

    M0 (net6 net3 0 0) nlvtlp w=0.135 l=length nfing=1 mult=1 srcefirst=1 \

            ngcon=1 mismatch=1 lpe=0 dnoise_mdev=0 dmu_mdev=0 dvt_mdev=0

    V4 (net3 0) vsource dc=1 type=dc

    V5 (net6 0) vsource dc=1 type=dc

    simulatorOptions options reltol=1e-3 vabstol=1e-6 iabstol=1e-12 temp=27 \

        tnom=27 scalem=1.0 scale=1.0 gmin=1e-12 rforce=1 maxnotes=5 maxwarns=5 \

        digits=5 cols=80 pivrel=1e-3 sensfile="../psf/sens.output" \

        checklimitdest=psf 

    dcOp dc write="spectre.dc" maxiters=150 maxsteps=10000 annotate=status

    dcOpInfo info what=oppoint where=rawfile

    dc dc param=length start=0.5 stop=10 lin=10 oppoint=rawfile maxiters=150 \

        maxsteps=10000 annotate=status

    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

    saveOptions options save=allpub subcktprobelvl=2


     

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