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Mail Archives: geda-user/2016/08/26/22:21:53

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From: "Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date: Sat, 27 Aug 2016 02:20:40 +0000
Message-ID: <CAM2RGhSaGOT=7-kwe+jn=j_wFYBDNEiN6O0=c1snR_ez5ah6ag@mail.gmail.com>
Subject: Re: [geda-user] Microwave PCB layout simulation or How to eat all
your processing power in 3 easy steps
To: gEDA users mailing list <geda-user AT delorie DOT com>
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On Fri, Aug 26, 2016 at 10:48 PM, Chad Parker
(parker DOT charles AT gmail DOT com) [via geda-user AT delorie DOT com]
<geda-user AT delorie DOT com> wrote:
> FWIW, this is something I've thought a lot about also. It would be very
> cool, but as with all simulation, to do it and get an answer out that
> actually resembles the real world is really hard. There are a lot of details
> that have to be taken into account, and then you have to make sure that your
> fab gets them all right too when you build the board. You can get maybe 10%
> variation in the dielectric constant of FR4, for example. PCB is not
> currently aware of many of those details, like board material, layer
> thickness, the amount of prepreg between the layers, etc. so you'd still
> have to add all that information in somewhere.
>
> I have a situation right now where I'm putting a couple of vias in close
> proximity to each other and counting on the parasitic capacitance to couple
> in a test signal. I'd love to be able to simulate and get an idea of what
> the capacitance actually is. I'll have to build and test it to really figure
> it out.
>
> BTW, you need more than just Hyperlynx to do this. You need the specific
> Hyperlynx 3D field solver module. My employer has licenses for MG, including
> Hyperlynx, but that module is licensed separately (I was just looking into
> this last week).
>
> I don't know much about gnucap, but it seems like in order to use it to
> simulate a PCB like this, you still need to be able to abstract a circuit
> model from the layout, and that's what the fancy, expensive programs do.

https://web.archive.org/web/20130830223605/http://lc.cray.com/

> --Chad
>
> On Fri, Aug 26, 2016 at 5:15 PM, al davis <ad252 AT freeelectron DOT net> wrote:
>>
>> On Fri, 26 Aug 2016 21:45:00 +0200
>> "Bert Timmerman (bert DOT timmerman AT xs4all DOT nl) [via geda-user AT delorie DOT com]"
>> <geda-user AT delorie DOT com> wrote:
>> > So basically you wish for a Hyperlynx exporter for pcb ;-)
>>
>> Good luck getting Mentor (owner of Hyperlynx) to do that.
>>
>> What you really need is an exporter to gnucap-Verilog, or a plugin for
>> gnucap to read (and write) the pcb format.
>>
>> If somebody wants to write that gnucap plugin, I will help you do it.
>>
>



-- 
Home
http://evanfoss.googlepages.com/
Work
http://forge.abcd.harvard.edu/gf/project/epl_engineering/wiki/

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