Hi,
That's an impressive collection of tools you have on video!
I am personally really interesting in Kicad having a full simulation
toolkit, but that's a lot of work :)
With Thomas, we have been trying to add some signal / power integrity
tools into kicad for some months now. ( mainly on the EM simulation side )
What we thought could be great to implement, just listing some, just in
case:
- Power Delivery Network analysis ( based on PCB )
- Via DC stress analysis ( based on PCB )
- Cross-talk / coupling
- RLCG parameter extraction ( based on a 2D simulation )
- Impedance matching / reflections
- Eye patterns ( based on IBIS files + PCB )
- Current path visualization ( based on PCB )
- 3D transient simulation ( based on IBIS + pcb )
We already made some FEM tests using sparselizard ( a FEM library ) ,
and got some results. From pcbnew, we can generate a 3D mesh from a
board and simulate:
- DC current flow / resistance between any two pads that share the same
net (3D solver),
- DC capacitance between any two nets (3D solver),
- R L C parameters are just a step away. (2D solver)
Our test repo is there, ( but requires setup described in Wiki to build ):
https://gitlab.com/pointhi/kicad/-/tree/sparselizard_fem
@Andrew, I could not find your IBIS parser on your github, could you
send a link ?
Regards,
Fabien Corona
On 31/08/2021 00:38, Andrew Zonenberg wrote:
Also of note...
I've got a bunch of tools in glscopeclient and
libscopehal/libscopeprotocols for NRZ/PAM4 signal generation, channel
emulation, de-embedding, equalization, clock recovery, eye patterns,
etc. Might be worth pursuing some kind of integration to develop a full
channel design/simulation tool kit in KiCAD down the road? I have an
IBIS parser already but haven't built a full IBIS simulator yet. It's on
the to-do list though. All of these tools are 3-clause BSD so license
compatible with KiCAD.
Ideally I'd like to integrate with an EM solver to extract a S-parameter
model of a PCB channel as well, so I can just click on pads of a board
to set up ports, configure a frequency sweep, then shove that into a
time domain model.
Here's a quick demo of some of the channel design tools:
https://www.youtube.com/watch?v=tgxtSVG4y_E
On 8/30/21 3:24 PM, Reece R. Pollack wrote:
I started down the path of creating an IBIS-to-Spice converter a couple
of years ago. I researched it enough to decide it was feasible, then
discovered a commercial product demo that would do enough of what I
needed at the time and stopped working on it.
I'd just about forgotten about it until you mentioned it.
-Reece
On 8/30/21 12:34 PM, Fabien Corona wrote:
Hello everyone,
I am working on an IBIS parser for kicad integration.
IBIS is a standard format to I/O buffers, that allows for "fast" and
accurate signal integrity simulations.
While parsing the IBIS format is not so hard, well... I have data to
simulate, but no simulator...
I was wondering if anybody in this mailing list had knowledge about
IBIS and / or SPICE simulation ?
From the info I gathered, it is quite "easy" to convert to convert to
a SPICE model, but maybe there are better ways to do.
( If we could avoid a whole simulator from scratch, that would be nice )
Basically, an IBIS file is :
- R L C parameters,
- voltage vs current tables
- voltage vs time tables
Regards,
Fabien Corona
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