[SI-LIST] Re: High speed signal-return path
- From: Jory McKinley <jory_mckinley@xxxxxxxxx>
- To: olaney@xxxxxxxx
- Date: Sat, 22 Sep 2007 22:11:06 -0700 (PDT)
Hello Orin,
There is in that the return current has to do just that, return. So for single
ended or common mode differential sourcing or sinking from power or ground
could make a significant difference, somewhat regardless of edge rate. All
mute for ideal differential of coarse.
-Jory
----- Original Message ----
From: "olaney@xxxxxxxx" <olaney@xxxxxxxx>
To: jory_mckinley@xxxxxxxxx
Cc: raja.anand@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Sent: Saturday, September 22, 2007 12:49:27 PM
Subject: [SI-LIST] Re: High speed signal-return path
We all know differential versus single ended, but "return current plane,
not ground" needs explanation if you feel that there is some nontrivial
difference at high frequencies between power and ground planes.
Orin
On Sat, 22 Sep 2007 10:36:14 -0700 (PDT) Jory McKinley
<jory_mckinley@xxxxxxxxx> writes:
Yes, however every plane is a potential return current plane, not ground,
less important for true differential more important for single ended.
How about any common mode noise on the differential signals, I would
think Option 1 would allow for better potential isolation.
-Jory
----- Original Message ----
From: "olaney@xxxxxxxx" <olaney@xxxxxxxx>
To: raja.anand@xxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Sent: Saturday, September 22, 2007 6:51:30 AM
Subject: [SI-LIST] Re: High speed signal-return path
Every power plane is a ground plane for high frequency purposes. There
should be no material difference between the two implementations. If
there is, something is really wrong with the power supply bypassing
strategy. The choice between stripline and microstrip is generally
driven by the particulars of the board layout. There is no definitive
choice of one over the other based on general principles, only as
circumstances dictate.
Orin Laney
On Sat, 22 Sep 2007 11:12:19 +0530 "Raja Anand" <raja.anand@xxxxxxxxx>
writes:
> Hi All,
> For high speed differential signals (3.125Gbps ), is it really
> required to
> take these signals between Gnd Planes. Which option should I go for
> from
> below if my stack up is symmetrical?
>
> Option1:
> L4 - Power
> L5 - Signal
> L6 ? GND
>
> Option2:
> L4 - GND
> L5 - Signal
> L6 ? GND
>
> Regards,
> Raja
>
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