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Simulators >> Circuit Simulators >> Regarding Circuit simulation with Ultrasim
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Message started by AMS_ei on Jan 21^st, 2017, 5:23am

Title: Regarding Circuit simulation with Ultrasim
Post by AMS_ei on Jan 21^st, 2017, 5:23am

Hi,

Could someone please explain me how Ultrasim simulates a mixed signal design and why it is called MMSIM?

Thank you.

Kind regards.

Title: Re: Regarding Circuit simulation with Ultrasim
Post by Andrew Beckett on Jan 21^st, 2017, 10:47am

Ultrasim doesn't simulate a mixed-signal design (well, it's not a mixed-signal simulator; it's a FastSPICE simulator). It's also not called MMSIM...

MMSIM (Multi-Mode Simulation) is a flexible set of simulation technology that gives access to circuit simulation (Spectre/APS), RF (Spectre RF), FastSPICE (XPS, and also the older UltraSim) and Mixed-Signal (AMS Designer, using Spectre, APS or UltraSim as the solver for the analog parts). There's a flexible token-based license model which means you can easily use the licenses you have to access any of the overall set of simulation capabilities, or you can have "a la carte" licenses for the specific simulators you want.

You can of course use any of these (including UltraSim) to simulate a mixed-signal design, but you'd probably be better off using a mixed-signal simulator (such as AMS Designer) if there's significant digital content or you have behavioural models for the digital parts.

Not sure if any of this answered your question, but then again it was pretty open-ended...

Regards,

Andrew.

Title: Re: Regarding Circuit simulation with Ultrasim
Post by AMS_ei on Jan 22^nd, 2017, 9:45am

Thank you, Andrew.
Could you please explain me how does Ultrasim simulate a Mixed Signal Design?

Thank you.

Kind regards.

Title: Re: Regarding Circuit simulation with Ultrasim
Post by Andrew Beckett on Jan 22^nd, 2017, 1:42pm

I don't understand your question. Are you expecting me to explain precisely how SPICE and FastSPICE simulators work? That's a topic for a book, not a forum reply.

There's a fair bit of background in the documentation, but you're going to have to ask something a bit more specific, I think.

Regards,

Andrew.