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ncsim with Ultrasim very slow for post layout simulation

dogrush

Hi,

I am using ams/ncsim with Ultrasim solver to simulate a mixed signal design.

For pre-layout of analog part, the simulation could be done within 10 mins.

But for post-layout of analog part, that is, to use the generated Calibre view instead of Schematic view, the simulation requires several hours to finish the total simulation.

I am wondering why the ams/ncsim simulator becomes so slowly for post-layout simulation?

Thanks.

Jerry

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  • Jerry,

    This depends on how the extracted view has been partitioned - if it has ended up with everything solved in the same partition and it's analog or SPICE, that will definitely get quite a bit slower because you have a much bigger matrix to solve. It's really hard to give advice here without understanding how things are set up so I'd strongly suggest you to contact customer support.

    Regards,

    Andrew.

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  • Jerry,

    This depends on how the extracted view has been partitioned - if it has ended up with everything solved in the same partition and it's analog or SPICE, that will definitely get quite a bit slower because you have a much bigger matrix to solve. It's really hard to give advice here without understanding how things are set up so I'd strongly suggest you to contact customer support.

    Regards,

    Andrew.

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