[SI-LIST] Re: Has the performance of the PDN in the receiver little effect on the SSN?
- From: xuzhengrong <Zhengrong.Xu@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 09 Jul 2008 17:43:31 +0800
Hi all,
Because of the display problem, my topo picture may not be shown =
correctly.
But I know that all is familiar with the IBIS buffer models.
Welcome experts who know the mechanism of the buffer structure and SSN =
to
discuss it.
Best Regards,
Zhengrong
HUAWEI TECHNOLOGIES CO.,LTD. huawei_logo
Address: Huawei Industrial Base
Bantian Longgang
Shenzhen 518129, P.R.China
www.huawei.com
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=D6=F7=CC=E2: Has the performance of the PDN in the receiver little =
effect on the
SSN?
Hi all,
As we know, SSN arises from PDN noise and crosstalk. Here I just talk =
about
the effect of PDN noise.=20
In some SSN simulation, I find that the PDN in the driver side plays the
dominant effect on SSN and the PDN in the receiver side plays little =
effect.
My explanation is as follows.
The following picture is a simple topology consisting of IBIS buffer =
models.
We know that large current will be pulled up or pulled down when a large
number of IOs switch simultaneous and generate large PDN noise which
aggresses quiet pin or stable level through the path of PDN.
However, the level changes only by C_comp charging or discharging in the
input buffer (clamp diodes also play a little effect on the waveform)
instead of pulling up current or pull-down from PDN like the output =
buffer.
Maybe there are also some noise in the node of nd_pc and nd_pc in the
receiver, but the noise hardly aggress signals in the receiver.=20
Therefore the performance of the PDN in the receiver has little effect =
on
the SSN.
And I just learn from books that SSO(simultaneous switching output noise =
)
is SSN and haven't seen the knowledge about the SSN in the receiver yet.
Is there any problem in my explanation? Can I make a conclusion that the
performance of the PDN in the receiver has little effect on the SSN?
Appreciate any idea on it.
output buffer
input buffer
--- ------------------------------------------------------
----------------------------------
| nd_pu nd_pc |
| nd_pc |
| ___|___ ___|___ |
| ___|___ |
| ---|__PU__| |__PC__| C_comp | ____
__________ ____ | C_comp |__PC__| |
| ____| |________|_____________|_| pkg |___{ =
Tline
}_| pkg |__|______________| |
| nd_in | ___| __ ___|___ __|__ | |____|
{_________} |____| | __|__ ___|___ |=20
| ---|__PD__| |__GC__| ____ |
| ____ |__GC__| |
| | | _|_
| | =
_|_
| |
| nd_pu nd_gc =3D |
| =3D nd_gc |
------ ----------------------------------------------------
----------------------------------- =20
Best Regards,
Zhengrong
=20
HUAWEI TECHNOLOGIES CO.,LTD. huawei_logo=20
Address: Huawei Industrial Base
Bantian Longgang
Shenzhen 518129, P.R.China
www.huawei.com
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This e-mail and its attachments contain confidential information from
HUAWEI, which is intended only for the person or entity whose address is
listed above. Any use of the information contained herein in any way
(including, but not limited to, total or partial disclosure, =
reproduction,
or dissemination) by persons other than the intended
recipient(s) is prohibited. If you receive this e-mail in error, please
notify the sender by phone or email immediately and delete it!
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