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TINA/Spice/THS4520: THS4520 irregular circuit warning

alpesh kavia1
Prodigy 210 points
Part Number: THS4520
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

I am getting 'Irregular circuit' error message during a transient analysis. The schematic passes ERC checking.

THS4520.TSC

  • 0
    TI__Mastermind 22494 points

    Hi Alpesh,

    I did a quick check of the THS4520 macro and examined the netlist.  It would seem a more recent an up to date version of the SPICE model is available from the TI website.  To check whether this might have been the reason for your odd error, I placed the newer model in your exact circuit, and ran the default 1us transient response with the selection to calculate an operating point.  The simulation ran without error.

    The exact error I got with the older circuit model in the file you attached involved net 19 with R9.  The values are the same across both models for R9 and net 19, so I think the difference is fairly subtle.  The newer model dates from 2011, which is around when many models gained more complete modeling of real-world factors.  TINA's internal library is usually populated with older models, so I advise to always check the dates against the newest up-to-date models on a part's page.

    Hopefully this answers your question and allows you to keep on designing!

    Alec

  • 0 in reply to Alec Saebeler
    Prodigy 210 points

    Thank you for the quick reply.