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simple RC circuit

Sali

 Dear all,

Can some one help me to understand why the voltage at time zero drops to a value less than 1 V?

Please check the attached file.

Thanks, 

Parents

  •  Dear all,

    I tried another example but this time with a DC source it didn't work properly until I changed the options under the transient analysis tab.

    The circuit and netlist is attached below.

    Thank you in advance,

     

    The netlist:

    // Generated for: spectre
    // Generated on: Apr  1 14:27:58 2014
    // Design library name: Chua3
    // Design cell name: rc2
    // Design view name: schematic
    simulator lang=spectre
    global 0
    include "/CMC/kits/cmosp13.V1.8.0.0DM/IBM_PDK/cmrf8sf/V1.8.0.4DM/Spectre/models/design.scs"
    include "/CMC/kits/cmosp13.V1.8.0.0DM/IBM_PDK/cmrf8sf/V1.8.0.4DM/Spectre/models/allModels.scs" section=tt

    // Library name: Chua3
    // Cell name: rc2
    // View name: schematic
    R0 (net03 net04) resistor r=1
    V0 (net03 0) vsource dc=8 type=dc
    C1 (net04 0) capacitor c=10n ic=0
    ic net04=0
    simulatorOptions options reltol=1e-3 vabstol=1e-6 iabstol=1e-12 temp=27 \
        tnom=25 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
    tran tran stop=60e-9 errpreset=moderate ic=all skipdc=yes \
        write="spectre.ic" writefinal="spectre.fc" annotate=status maxiters=5
    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
    saveOptions options save=allpub 

     

Reply

  •  Dear all,

    I tried another example but this time with a DC source it didn't work properly until I changed the options under the transient analysis tab.

    The circuit and netlist is attached below.

    Thank you in advance,

     

    The netlist:

    // Generated for: spectre
    // Generated on: Apr  1 14:27:58 2014
    // Design library name: Chua3
    // Design cell name: rc2
    // Design view name: schematic
    simulator lang=spectre
    global 0
    include "/CMC/kits/cmosp13.V1.8.0.0DM/IBM_PDK/cmrf8sf/V1.8.0.4DM/Spectre/models/design.scs"
    include "/CMC/kits/cmosp13.V1.8.0.0DM/IBM_PDK/cmrf8sf/V1.8.0.4DM/Spectre/models/allModels.scs" section=tt

    // Library name: Chua3
    // Cell name: rc2
    // View name: schematic
    R0 (net03 net04) resistor r=1
    V0 (net03 0) vsource dc=8 type=dc
    C1 (net04 0) capacitor c=10n ic=0
    ic net04=0
    simulatorOptions options reltol=1e-3 vabstol=1e-6 iabstol=1e-12 temp=27 \
        tnom=25 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
    tran tran stop=60e-9 errpreset=moderate ic=all skipdc=yes \
        write="spectre.ic" writefinal="spectre.fc" annotate=status maxiters=5
    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
    saveOptions options save=allpub 

     

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