[SI-LIST] Re: Where is the Return Current when signal transition from GND reference to POWER reference
- From: "Loyer, Jeff" <jeff.loyer@xxxxxxxxx>
- To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 1 Mar 2012 01:10:20 +0000
Could you please send me a copy of your paper?
Thank you,
Jeff Loyer
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Oh, Dan
Sent: Wednesday, February 29, 2012 9:23 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Where is the Return Current when signal transition from
GND reference to POWER reference
Hi Tesla,
In addition to Eric's paper, I have also written a paper on this subject and
published in IEEE last year:
D. Oh, "Plane bounce in high-speed single-ended signaling systems," DesignCon
2012.
If you have access to DesignCon, I also wrote a paper with little more details
this year:
D. Oh, "Plane bounce in high-speed single-ended signaling I/O interfaces,"
EPEPS conference 2011.
Please let me know if you do not have access for any of these. I can forward to
you.
Best,
- Dan Oh
___________________________________________
Dan (KyungSuk) Oh, Ph.D.
Technical Director of Signal and Power Integrity Rambus Inc.
(B) 408-462-8363
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Bill Martin
Sent: Wednesday, February 29, 2012 5:08 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Where is the Return Current when signal transition from
GND reference to POWER reference
Tesla,
Eric Bogatin has published some analysis on a similar design in his Blog.
It was posted Sept 2010 concerning Cross Talk in Differential Channels (return
path discontinuities).
Location: http://bethesignal.net/blog/?m=201009
Regards,
Bill
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Tesla
Sent: Wednesday, February 29, 2012 2:51 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Where is the Return Current when signal transition from GND
reference to POWER reference
Hi, experts
I have a question that buffled me a long time.
Suppose i have a four layers board. L1:TOP L2:GND L3:POWER L4:Bottom (GND
and POWER are ground plane and Power plane), there are not any connections
between L2:GND and L3:POWER. they are independant planes. there is not even a
capacitor between them.
If I have a 200mils signal trace run on L1: TOP, Then it transition to
L4:Bottom layer through a through hole via. The signal trace also run 200mils
on L4:Bottom. I design the Signal trace as 50ohm.
Now, if i launch AC signal into signal trace on L1:Top layer. Would i mearsure
signal between L4:Bottom and L3:POWER at the end of signal trace.
I believed that there is not voltage between the trace and POWER Plane, because
the return current can't find a way to transition to L3:POWER.
But when i simulated the case in HFSS. I get a result that it has S-parameter
like a 400 mils microstrip from DC to 1Ghz.
which is correct?
Hope such silly question not bother you.
Thanks.
Tesla.
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