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How to save value of global parameter in Spectre

svcher

Hello,


Is there a way to save value of a global parameter in Spectre?

For example, below I use global parameter "fo" to define frequency of AC simulation.  Can I save it together with other simulation results, like current through "v1" in this example?  Is there syntax similar to HSPICE's ".print par('fo')"?

Thanks!

======================================

c1 (1 0) capacitor c=1e-15

v1 (1 0) vsource dc=0 mag=1

parameters fo=1e6

ac1 ac freq=fo

save v1:n

======================================

  • Andrew Beckett

    Yes, you can use the "info" analysis in spectre. If you just want it to appear on the screen, you can put:

    params info what=parameters where=screen

    in the netlist. Or where=logfile to appear in the log file, or where=file (and optionally file="file.txt" to change the default file), or you where=rawfile in which case it will save it in a  database you can open in ViVA.

    See "spectre -h info" for more details.

    Regards,

    Andrew.

  • svcher
    Thank you Andrew, I was hoping I could get it in the same bunch as the currents and voltages, but info should be fine as well.
  • Andrew Beckett

    If you use rawfile it would still show up in the ViVA results browser just like ac - so that ought to be straightforward enough? I know in this case you're not doing a sweep in the ac, but in the general case where you'd do a sweep of something (e.g. frequency) in the ac, you'd not want to have the parameter in the ac results at each frequency. Also if you did a tran, dc, pss etc - you wouldn't want it in each and every one. The parameter is nothing to do with the specific analysis, which is why spectre has this logical distinction and can save the results of such things in invocations of the info analysis.

  • svcher
    I understood the logic, thank you.

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