Re: [IBIS-Users] 答复: [IBIS-Users] A question about the ibis simulation.

You need to look at the assigned parasitics for
each component. One way to see these are to export
the SPICE model and look at the netlist. Another
way is to select each component and look at its
properties.

What you are looking for:
What parasitics are assigned for the resistor?
What parasitics are assigned for the driver package?
What parasitics are assigned for the receiver package?

These parasitic values might come from the IBIS
file at the Component, Pin, or Package level.
Parasitic values might also be set to a default
for "standard package" parts.

- Lynne

On 7/6/2011 3:35 AM, Zhanggezi wrote:
>
> Hi All,
>
> The topology is below. And ibis file is very
> large, I will share with you if needed after
> deleting unnecessary information.
>
> And the probe is on the receiver, three
> simulation outputs are different corners for one
> model(fast,typical and slow corners), and I
>
> Want to the reason for the spike. Any one can help?
>
> *发件人:*owner-ibis-users@eda.org
> [mailto:owner-ibis-users@eda.org] *代表
> *Muranyi, Arpad
> *发 送时间:*2011年7月5日23:52
> *收件人:*'ibis-users'
> *主题:*RE: [IBIS-Users] A question about the
> ibis simulation.
>
> Naftali,
>
> I am not sure I understand what the “The
> topology is one on one” is
>
> referring to in the original question. So I am
> not sure what
>
> you mean by “set a very same length to both T
> branches” either. Please
>
> clarify your question.
>
> Thanks,
>
> Arpad
>
> ==============================================================
>
> *From:*naftali refaeli
> [mailto:Naftali.Refaeli@ecitele.com]
> *Sent:* Tuesday, July 05, 2011 10:49 AM
> *To:* Muranyi, Arpad; 'ibis-users'
> *Subject:* RE: [IBIS-Users] A question about the
> ibis simulation.
>
> Do you mean that If he will set a very same
> length to both T branches – then the phenomenon
> will disappear?
>
> Naftali Refaeli
>
> CAE Engineer
>
> ITO
>
> HP Enterprise Services
>
> Telephone +972 3.9266973
>
> Mobile +972 52.3542043
>
> Email Naftali.Refaeli@ecitele.com
> <mailto:Naftali.Refaeli@ecitele.com>
>
> *From:*owner-ibis-users@eda.org
> [mailto:owner-ibis-users@eda.org] *On Behalf Of
> *Muranyi, Arpad
> *Sent:* Tuesday, July 05, 2011 6:45 PM
> *To:* 'ibis-users'
> *Subject:* RE: [IBIS-Users] A question about the
> ibis simulation.
>
> Grace,
>
> It looks like that the first ledge is the
> voltage that the
>
> driver can drive with the load imposed on it by
> the T-line.
>
> Once the reflection comes back to the driver the
> voltage
>
> steps up to the full swing levels. This is basic
> T-line
>
> theory.
>
> Arpad
>
> ============================================================
>
> *From:*owner-ibis-users@eda.org
> [mailto:owner-ibis-users@eda.org] *On Behalf Of
> *Zhanggezi
> *Sent:* Monday, July 04, 2011 8:54 PM
> *To:* 'ibis-users'
> *Subject:* [IBIS-Users] A question about the
> ibis simulation.
>
> Hi All,
>
> The topology is one on one. The simulation
> result is below. I am curious about the
> simulation circled
>
> by red pink. What’s the cause? Could someone
> give me any hint?
>
> Thank you.
>
> Grace
>
>
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