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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

  • Hi Joris, did that issue got resolved? Actually I am also facing the same problem.

  • FormerMember
    FormerMember in reply to amrvlsi

    Dear amrvisi,

    JorisLambrecht said:

    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.

    The only potential issues that I can think of that may lead to a simulation result of an identical netlist are:

    1. If your PDK has been changed between the two simulations. This will potentially change model parameters for devices in your netlist and lead to different results when compared to our "original" simulation results.

    2. If the version of spectre you are using has changed. In even this case, any difference in results will be quite small.

    If neither 1 nor 2 are true, then the two netlists (i.e., original and "copied" version) must be different. You can easily do a comparison of the two input.scs files using tkdiff or a UNIX diff to examine potential differences.

Reply
  • FormerMember
    FormerMember in reply to amrvlsi

    Dear amrvisi,

    JorisLambrecht said:

    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.

    The only potential issues that I can think of that may lead to a simulation result of an identical netlist are:

    1. If your PDK has been changed between the two simulations. This will potentially change model parameters for devices in your netlist and lead to different results when compared to our "original" simulation results.

    2. If the version of spectre you are using has changed. In even this case, any difference in results will be quite small.

    If neither 1 nor 2 are true, then the two netlists (i.e., original and "copied" version) must be different. You can easily do a comparison of the two input.scs files using tkdiff or a UNIX diff to examine potential differences.

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