Re: [SI-LIST] : One Differential To Another

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From: Michael Nudelman (mnudelman@tellium.com)
Date: Fri Nov 10 2000 - 17:04:51 PST


This once was discussed here relating to connectors connection to
broadside/edge coupled traces.
The concensus as I remember was: if you don't have much of common mode
signal - you don't have to worry much. If you do - try to be consistent
in your transm. line coupling throughout the whole path.

Mike.

George Rasko wrote:

> I was wondering if there was anyone who had experienced problems
> with differential signalling when one implementation transitions to
> another. For example, assume the target is 100 ohms differential.
> The backplane implements an edge coupled pair with individual trace
> to ground impedance of 70 ohms and 100 ohms diff, but the daughter
> card implements two traces with 50 ohms to ground on opposite sides
> of the the ground plane (once again, 100 ohms diff), is this a signal
> quality problem waiting to happen?
>
> George
>
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