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same schematic and analysis - different results?

JorisLambrecht

Hello all,


I' ve experienced a strange problem: I copied an original schematic  via the Library Manager and copied the corresponding

ADE L states myself (in the .artist_states folder). I then simulate this copy of the schematic with the copy of the state,

but I get a different output than in the case of the original schematic+state, even for a DC analysis?

All variables are set to the same values.

It is probably hard to point out the problem based on this information, but I guess I am making a beginner's mistake somewhere? (Although I've done this before and then everything worked.)

Kind regards,

Joris

Parents

  • Hello all,


    the input.scs files are identical (apart from the  version number).

    One version simulates correctly, the other one does not simulate at all (neither pss or tran ...)

    The problem lies in a quarter wavelength transmission line (an mtline-component and an s2p-file (the s-parameters

    were generated in another simulator)). In the original schematic, no errors occur.

    In the copied schematic, it does not converge:


    Warning from spectre during initial setup.
        WARNING (CMI-2504): I75: Diagonal elements of G matrix should be positive.

    ...

    Warning from spectre during IC analysis, during periodic steady state analysis `pss'.
        WARNING (SPECTRE-223): Detected NaN at node I75:t_ib2_1.

    Kind regards,

    Joris

Reply

  • Hello all,


    the input.scs files are identical (apart from the  version number).

    One version simulates correctly, the other one does not simulate at all (neither pss or tran ...)

    The problem lies in a quarter wavelength transmission line (an mtline-component and an s2p-file (the s-parameters

    were generated in another simulator)). In the original schematic, no errors occur.

    In the copied schematic, it does not converge:


    Warning from spectre during initial setup.
        WARNING (CMI-2504): I75: Diagonal elements of G matrix should be positive.

    ...

    Warning from spectre during IC analysis, during periodic steady state analysis `pss'.
        WARNING (SPECTRE-223): Detected NaN at node I75:t_ib2_1.

    Kind regards,

    Joris

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