[SI-LIST] Re: Package Model in IBIS
- From: Russell Dill <Russ.Dill@xxxxxxx>
- To: "Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx>
- Date: Tue, 28 Jun 2011 00:34:54 -0700
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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