Subject: [IBIS-Users] [Fwd: Validation of IBIS model]
From: Anshuli Goel (anshuli@india.ti.com)
Date: Mon Dec 30 2002 - 22:49:22 PST
Resending with correct waveform.
Anshuli
Anshuli Goel wrote:
> Hello IBIS Gurus
>
> I am trying to simulate the IBIS model in Spice for it's validation .
>
> I generated the IBIS model by s2ibis2 script. After that I had two
> case.
>
> 1. Simulate the spice netlist of the buffer with some load .
> 2. Replace the subckt of buffer with IBIS model for same setup and
> compare these two results.
>
> I used the following setup :
>
> Buffer
> | \
> R ______________
> ------| \-------/\/\/\/\/\---|_______|
> |______ Load
> |/
> | |__Tx___________ |
> _|_
> ___ C
> |
> |
> \/
>
>
> In Ist case I have the spice subckt of the buffer and in second case I
> replced the subckt of buffer with IBIS model.
> The other end of Tx is left open .
> In the ouput file at the junction of cap I see a lots of ringing in
> first case while with IBIS model I don't see any ringing. Why this is
> happening. Why the IBIS model is not able to give any ringing?
>
> I am attaching the waveforms for both of the cases for reference.
>
> Waveform with IBIS model :
> [Image]
>
>
> Waveform with Spice simulation :
>
> [Image]
>
>
>
>
> Is this the trend or is there anything wrong in my setup ?
>
> Regards
> Anshuli Goel .
>
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