[SI-LIST] Re: questions for 2-layer PCB simulation

Tina, if your frequency domain results are off, then likely the plane is 
too close.  What are you using to determine your reference result?  If it 
is a test board, how close is it to any large pieces of metal?

Regards,


Steve
At 10:01 AM 9/30/2005 +0800, ??? wrote:
>Dear All,
>     Thanks for your reply. Here, I added a ground plane to close to
>the real impedance at time-domain. But it doesn't work at frequency
>domain. If I add a ground plane, it'll destroy the structure. That I can't
>get the exact resonant frequency. Maybe I will get more correct results
>by another way. Thanks!!
>
>Best Regards
>Tina
>
>----- Original Message -----
>From: "Ralf Bruening" <ralf.bruening@xxxxxxxx>
>To: "Hargin, Bill" <bill_hargin@xxxxxxxxxx>
>Cc: <tinawu@xxxxxxxxxxxxxx>; <si-list@xxxxxxxxxxxxx>
>Sent: Thursday, September 29, 2005 1:55 PM
>Subject: Re: [SI-LIST] Re: questions for 2-layer PCB simulation
>
>
> > Hello Tina, hello Bill,
> >
> > what you describe is trying to trick the physics a little bit (as
> > there is no determined Zo without a ground plane) - I made as
> > well the experience that this may (but not must !!!) model reality
> > rather OK for getting an idea of the net behaviour.
> >
> > regards
> >
> >        Ralf
> >
> > P.S.: Some other SI tools do add this plane (changable by an
> > option) automatically when launching the field solver and not
> > detecting a reference layer ;-)
> >
> >
> > Thursday, September 29, 2005, 6:20:29 AM, you wrote:
> >
> > HB> Hi Tina:
> >
> > HB> I can't speak for other simulation tools, but in HyperLynx, you would
> > HB> import the 2-layer board, and then add a 1000 mil thick layer of air
> > HB> (Er=3D1.0), followed by a reference plane.  Both the field solver guys
>=
> > HB> and
> > HB> customers who have tried this say that it works well.  If you want to
> > HB> validate this approach on one of your designs, let me know, and I'll
>try
> > HB> to connect you with the right people.=20
> >
> > HB> Bill Hargin
> > HB> Product Manager - HyperLynx
> > HB> Mentor Graphics Corp.
> > HB> 425-301-4425 - Mobile
> >
> > >> -----Original Message-----
> > >> From: si-list-bounce@xxxxxxxxxxxxx=20
> > >> [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of=20
> > >> tinawu@xxxxxxxxxxxxxx
> > >> Sent: Tuesday, September 27, 2005 7:20 PM
> > >> To: si-list@xxxxxxxxxxxxx
> > >> Subject: [SI-LIST] questions for 2-layer PCB simulation
> > >>=20
> > >> Dear All,
> > >>     I have simulated the SI and PI for 2-layer PCB. I found=20
> > >> some tools based on 2D EM method.
> > >> It makes the results wrong. Could you tell me how to close to=20
> > >> the real condition by setting some parameters or adding some=20
> > >> planes?? Thanks in advance.
> > >> Best Regards
> > >> Tina
> > >> ------------------------------------------------------------------
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> >
> > _____________________________________________
> >
> > Ralf Bruening
> > Product Manager High Speed Design/Partner & Solution Business
> > Zuken EMC Technology Center
> > Vattmannstr.3
> > 33100 Paderborn
> > Germany
> >
> >
> > Tel: ++49 (0) 5251 150 600 (direct -621)
> > Fax: ++49 (0) 5251 150 700
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> >
> > Email: ralf.bruening@xxxxxxxx
> > Web: www.zuken.com
> > _____________________________________________
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>
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