[SI-LIST] Re: Package Model in IBIS
- From: "Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx>
- To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 28 Jun 2011 14:24:48 +0000
"Right, but what tells you that the line is 0.001
meter long and not 0.001 mm long?"
If it was 0.001 mm long it would also have to be
L = 2000 nH/mm
C = 3000 pF/mm
But you only need to know whether it is m or mm
if you want to build the package (or board in
the case of EBD). For simulations it doesn't
matter as long as all the length and per length
values are consistently the same.
Arpad
=================================================
-----Original Message-----
From: Russell Dill [mailto:Russ.Dill@xxxxxxx]
Sent: Tuesday, June 28, 2011 2:35 AM
To: Muranyi, Arpad
Cc: si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] Re: Package Model in IBIS
On Mon, Jun 27, 2011 at 11:14 AM, Muranyi, Arpad
<Arpad_Muranyi@xxxxxxxxxx> wrote:
> Russell,
> Reading between the lines of your question it seems that
> you imply that the cancellation I mentioned "gets rid" of
> some "negligible" delay. If this is what you are thinking
> I have the feeling that you misunderstood what I was trying
> to say.
>
> Let me illustrate this with an example:
>
> If you have a package model which was generated using meters
> as the unit for length and has the following data:
>
> L = 2000 nH/m
> C = 3000 pF/m
> Length = 0.001 meter
>
> then the simulator will make a model which consists of
>
> L=2nH
> C=3pF
>
> Notice that the length canceled out. However, these numbers
> can still be converted to impedance (Zo) and time delay (Td)
> with the usual equations (in case you wanted to model this
> with a T-line), so no delays are lost...
>
Right, but what tells you that the line is 0.001 meter long and not
0.001 mm long?
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