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ADEXL Save all currents

PNadeau

Dear folks,

I am trying to save all currents entering the pins of schematic instances up to a certain level for a Spectre PSS simulation.

In ADEXL, I right click in the outputs table somewhere, click Save All, and configure: Save device currents -> selected, subcktprobelvl->3, useprobes -> yes.

If I run a DC simulation I get the correct behaviour (currents saved up to a certain level, I can see it in the Results Browser)

If I run PSS, no currents are saved.

This is the relevant line that appears in the netlist

saveOptions options save=all currents=selected subcktprobelvl=3 useprobes=yes

Anyone have an idea how to save all currents in PSS?

Thanks in advance,
Phil

Parents
  • Andrew Beckett

    I suspect this is an optimisation performed because using subcktprobelvl is expensive - you can end up with a lot of iprobes in the circuit which can significantly impact performance (particularly with PSS). That said, it does this silently and there doesn't seem to be a way to disable it (the instance preservation that Frank suggested doesn't work - I wouldn't have expected it to). 

    The workaround is to explicitly save the currents you want. Unfortunately even if you select currents using Outputs->To be Saved->Select by Subckt Inst and tell it to save a certain depth of currents, that doesn't work either - you have to explicitly save all the currents you want.

    This may be an oversight - because with transient it works fine - as soon as you add pss, it breaks. So please contact customer support about this. I didn't see any reports of this issue so far.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    I suspect this is an optimisation performed because using subcktprobelvl is expensive - you can end up with a lot of iprobes in the circuit which can significantly impact performance (particularly with PSS). That said, it does this silently and there doesn't seem to be a way to disable it (the instance preservation that Frank suggested doesn't work - I wouldn't have expected it to). 

    The workaround is to explicitly save the currents you want. Unfortunately even if you select currents using Outputs->To be Saved->Select by Subckt Inst and tell it to save a certain depth of currents, that doesn't work either - you have to explicitly save all the currents you want.

    This may be an oversight - because with transient it works fine - as soon as you add pss, it breaks. So please contact customer support about this. I didn't see any reports of this issue so far.

    Regards,

    Andrew.

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