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

The reason for the spice is most likely
the capacitance in the receiver.

Arpad
========================================

From: Zhanggezi [mailto:gezi.zhang@huawei.com]
Sent: Wednesday, July 06, 2011 5:35 AM
To: Muranyi, Arpad; 'ibis-users'
Cc: 'yang@huawei.com'
Subject: 答复: [IBIS-Users] A question about the ibis simulation.

Hi All,

The topology is below. And ibis file is very large, I will share with you if needed after deleting unnecessary information.
[cid:image002.png@01CC3BB9.215244D0]

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?
[cid:image003.jpg@01CC3BB9.215244D0]

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?



  [cid:image004.png@01CC3BB9.215244D0]



Thank you.



Grace

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