Re: [IBIS-Users] How do simulators handle C_Comp?

In practice, I would like to know how simulators such as Hyperlynx account
for this C_comp? Does it exclude double-counting of the C_comp when
performing rise/fall time domain simulations?

Can someone from the tool vendor answer this question?

Thanks,

Sanjay Mehta
Xilinx

"Muranyi, Arpad" wrote:

> Lee,
>
> The IBIS model's IV curve which determines its impedance
> does not include any C_comp effects.  The Vt curves which
> are used to turn on and off the IV curves do include the
> C_comp effect in their shape, but they do not effect the
> DC nature of the IV curves.  Therefore we do need to add
> a capacitor to account for the capacitive nature of the
> drivers (or receivers).  As stated in another response,
> this is necessary for getting the correct reflections
> in the simulations when a wave hits the model.
>
> Arpad Muranyi
> Intel Corporation
> ------------------------------------------------------------
>
> -----Original Message-----
> From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
> Behalf Of lee yang
> Sent: Tuesday, March 01, 2005 8:58 PM
> To: ibis-users@eda.org
> Subject: [IBIS-Users] C_Comp
>
> Hi,
> Since the C_Comp effect is already embedded in the Spice model, hence,
> the generation of IBIS model automatically includes the effect of it. I
> am wondering, since the C_Comp effect is already included in the IBIS
> model, why do we still need to put it in the IBIS file? Why it is so
> important?
> Thanks a lot.
> -Lee
>
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