FreeLists / si-list / [SI-LIST] Re: diff signaling

[steve weir <weirsp@xxxxxxxxxx>]

Chris, it depends on how exact you want the averaging to be.  Along the 
radial that forms an Isosceles triangle, the cancellation is nearly perfect.
Steve.
At 06:11 AM 4/2/2004 -0800, Landrum, Chris wrote:
>I have been searching through the archive for information regarding this but
>I have not come up with anything concrete.
>Many people mention using differential signaling in an effort to reduce
>common mode noise. Looking through Lee Ritchey's book "Right the First
>Time", his discussion implies that this is not the case. For there to be
>common mode noise rejection between two traces, the fields would have to be
>equal and opposite. In a PCB structure with a diff pair referencing GND
>planes (say in a stripline topology) this seems impossible! Routing signals
>next to eachother is convenient for length matching (skew management) but I
>don't see much else.... Any thoughts.
>
>And I do apologize if this has been discussed in detail before.
>Thanks
>Chris
>
>
>
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Steve Weir
Teraspeed Consulting Group LLC
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