[SI-LIST] : Other ways of transmitting differential signalling besides edge coupled traces or broad side coupled traces

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From: Salvador Aguinaga (Salvador_Aguinaga@mw.3com.com)
Date: Thu Feb 17 2000 - 16:29:32 PST


---------------------- Forwarded by Salvador Aguinaga/MW/US/3Com on 02/17/2000
06:31 PM ---------------------------

From: Salvador Aguinaga/MW/US/3Com on 02/17/2000 01:09 PM

Sent by: Salvador Aguinaga - eNetworks HW Engineer, Carrier Systems Group

To: "'si-list @silab.eng.sun.com'" <si-list@silab.eng.sun.com>
cc:
Subject: Other ways of transmitting differential signalling besides edge
      coupled traces or broad side coupled traces

All,

I would like to know you thoughts on 2 routing structures/geometries for
differential signalling (LVPECL)

1. Routing differential pairs not coupled to each other. Can differential
signalling be successfully transmitted over two independent 50 ohm traces?

2. Routing differential pairs broadside

_______________ plane
 core
   ______ signal + (50 ohm referenced to the top plane)
 prepreg
_______________ plane
 core
   ______ signal - (50 ohm referenced to the top plane)
 prepreg
_______________ plane

Can this be done for differential signaling ("broadside") ? Are there other
methods of transmitting differential signals over traces that are not
Edge-coupled or Broadside coupled?

-- 

žal

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