Author Topic: Can this be simulated in Altium?  (Read 1829 times)

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Offline Alexei.Polkhanov

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Can this be simulated in Altium?
« on: April 04, 2015, 08:33:50 am »
I have to admit I am somewhat a fun of circuit simulation. I use PSpice and most of my simulations usually not that complex - 10-20 passive components, one or two opamps. I also hate PSpice because of how ugly broken and unfriendly schematic editing tool that comes with it - "OrCad Capture".
Here I have attached a single schematics for Transimpedance amplifier. There is a single CURRENT pulse source that is used to simulate a photo diode. I got this simulated in PSpice in about 30 minutes including import of OPA659 model that I downloaded from TI website. Can this be simulated in Altium? Today I have heard a huge rant from somebody who spent 3 days trying to tweak SPICE simulator in Altium to converge with exactly same configuration. Conclusion - current sources in Altium and current pulse (IPULSE) do not work.

Is it true? Can anyone share their experience with subject?

Offline T3sl4co1l

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Re: Can this be simulated in Altium?
« Reply #1 on: April 04, 2015, 06:15:50 pm »
I've found it's exactly as easy and troublesome as any other commercial grade simulator.

All of them, from free 3f5 SPICE, to $10k+ Altium's SPICE engine, are all based on either the original Berkeley 3f5, or the somewhat later XSPICE (also an academic byproduct; Georgia Tech I think??).

They almost all have custom tweaks, like PSpice's proprietary notation (syntax, built-in functions, and probably convergence tweaks), Altium's partial support of many things (including some PSpice, and maybe just a hint of HSpice), and probably most significantly, LTSpice's heavily tweaked solver ("modified TRAP", actual real no fooling multiprocessor support, etc.).

In short, it doesn't matter what you're paying (or not), they all suck uniformly, just in different ways...

Anyway, not to continue into the relative differences of the various packages, I'll simply close in saying: no, there's nothing fundamentally different about Altium's.  It's harder to drive, but the convergence is just as good/bad as the user sitting in front of it.

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