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Initial Condition for Inductor

tester

Dear All,

I am using  Cadence IC5141 and running a simulation which requires the ".IC" setup for inductors. I tried to put some value under the "initial condition" field of the inductor, but the value is going when I doubly confirmed it with the transient analysis. Are there anything that I may miss or the initial condition of the inductor does not work at all? By the way, are there any alternative way to figure this out? Thanks a lot in advance.

 

 

 

Parents

  • What version of spectre are you using ("spectre -W" should tell you this, or it also appears in the spectre log file)?

    To upload the picture, I just created myself an account on  pict.com and then did File->Save Image from ViVA (wavescan too) and saved a png file - I uploaded this to pict.com and then used the little image icon when posting to reference the image URL.

    I tried both an MMSIM71 ISR and an IC5141 ISR for spectre, and they both gave the same results I posted. I didn't cjhange anything - just ran "spectre indic.scs" (indic.scs was your netlist, which I cut and paste and fixed the line wraps):

    // Design view name: schematic
simulator lang=spectre
global 0

 

// View name: schematic
V1 (net38 0) vsource dc=1.8 type=dc
R1 (net31 net15) resistor r=1K
R0 (net30 net13) resistor r=1K
C2 (net30 net31) capacitor c=300f ic=-30m
C1 (net13 net15) capacitor c=100f ic=300m
L1 (net38 net31) inductor l=70n
L0 (net38 net30) inductor l=70n ic=500u
ic net13=0.35 net30=-40m

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
tran tran stop=0.001m errpreset=conservative maxstep=100p ic=all  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

     

    Regards,

    Andrew.

Reply

  • What version of spectre are you using ("spectre -W" should tell you this, or it also appears in the spectre log file)?

    To upload the picture, I just created myself an account on  pict.com and then did File->Save Image from ViVA (wavescan too) and saved a png file - I uploaded this to pict.com and then used the little image icon when posting to reference the image URL.

    I tried both an MMSIM71 ISR and an IC5141 ISR for spectre, and they both gave the same results I posted. I didn't cjhange anything - just ran "spectre indic.scs" (indic.scs was your netlist, which I cut and paste and fixed the line wraps):

    // Design view name: schematic
simulator lang=spectre
global 0

 

// View name: schematic
V1 (net38 0) vsource dc=1.8 type=dc
R1 (net31 net15) resistor r=1K
R0 (net30 net13) resistor r=1K
C2 (net30 net31) capacitor c=300f ic=-30m
C1 (net13 net15) capacitor c=100f ic=300m
L1 (net38 net31) inductor l=70n
L0 (net38 net30) inductor l=70n ic=500u
ic net13=0.35 net30=-40m

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
tran tran stop=0.001m errpreset=conservative maxstep=100p ic=all  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

     

    Regards,

    Andrew.

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