FreeLists / si-list / [SI-LIST] Re: IBIS question!!

[吳亭瑩 <tinawu@xxxxxxxxxxxxxx>]

Dear Lynne,
    Thanks for your great help!!
    Here, I run a 2.5 GHz signal that has termination.
1. I run the IBIS with 50 psec DC sweep step, the waveform is close to SPICE
model. When I set smaller DC sweep step, the dc bias and voltage swing of
waveform are wrong.
2. The signal has termination and I set smaller DC sweep step(VI points >
100), so I think I just focus on some voltage range.
Welcome your comments. Thanks!!

Best Regards
Tina

----- Original Message -----
From: "Lynne Green" <lgreen22@xxxxxxxxxxxxxx>
To: <tinawu@xxxxxxxxxxxxxx>; "'Si-List'" <si-list@xxxxxxxxxxxxx>
Sent: Wednesday, June 02, 2004 4:14 AM
Subject: [SI-LIST] Re: IBIS question!!


> Answers inserted.
> - Lynne
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On
> Behalf Of ???
> Sent: Monday, May 31, 2004 5:20 AM
> To: si-list@xxxxxxxxxxxxx; akvarma@xxxxxxxx
> Subject: [SI-LIST] IBIS question!!
>
> Dear All,
>     I have some questions about creating IBIS file for PCIExpress(analog
> signal).
> 1. Does the IBIS model is better when DC voltage sweep of VI table is
> smaller??
>
> -- Yes.  Better yet, a table has more points where the slope is changing
> fastest, and fewer where is changing slowly.  (Generally, too many points
> slows simulation; too few points reduces accuracy.)
>
> 2. If the output voltage swing of the pad is 0~3.3V, does it means the
> voltage range(0V~3.3V) of the VI table is enough.
>
> -- The reflection at the end of a transmission line could DOUBLE the
signal
> swing.  So you would need -3.3 to 6.6 (2*3.3) for each V-I table voltage
> range.
>
> Best Regards
> Tina
>
>
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