Re: [IBIS-Users] c_comp calculation

thanks Arpad

If buffer input signal is PRBS-7, 2.5Gbps, there would be many frequency
components in the signal. So what should most likely operating frequency be
in this case?

Regards
Shivani

On Tue, Nov 11, 2014 at 9:12 PM, Muranyi, Arpad <Arpad_Muranyi@mentor.com>
wrote:

>  Shivani,
>
>
>
> #1)  The V-t data in IBIS models includes the C_comp effects, this
>
> is why C_comp shouldn’t be visible from the inside, because that
>
> means that the V-t data is not loaded by C_comp to slow it down.
>
> An IBIS simulator should reproduce the V-t data if you load the
>
> buffer with the same V_fixtre and R_fixture load with which the
>
> V-t data was generated, no matter what C_comp value you have.
>
>
>
> #2)  You should use the frequency for obtaining C_comp which is
>
> most representative of the buffer’s signal frequency.
>
>
>
> I hope this helps,
>
>
>
> Arpad
>
> =====================================================================
>
>
>
> *From:* owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] *On
> Behalf Of *Shivani Sharma
> *Sent:* Tuesday, November 11, 2014 4:57 AM
> *To:* ibis-users@eda.org
> *Subject:* [IBIS-Users] c_comp calculation
>
>
>
> Hi all
>
>
>
> I have a few queries-
>
>
>
> 1. C-comp is invisible looking from inside but visible looking from
> outside of Tx driver model.  In IBIS, does V-t include c_comp effects?.
> During spectre sims, changing pad capacitance does change V-t data.
>
>
>
> 2. To calculate c_comp, how is most likely operating frequency of buffer
> decided.
>
>
>
>
>
> thanks
>
> Shivani
>
>
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