[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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>>=20
>>=20
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_____________________________________________
 
Ralf Bruening 
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