[SI-LIST] Re: Tightly coupled VS loosely coupled diff pairs
- From: MikonCons@xxxxxxx
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 6 Sep 2001 14:51:04 EDT
Chris:
Loose versus tight coupling: The obtainable degree of coupling for
edge-coupled traces is very limited; however, the tighter the better. Both
source coupling and victim coupling is reduced by closer spacing of the
traces, as is radiated emissions. The use of loosely coupled traces makes
life easier for the layout designer, but is NOT technically better from the
design margin standpoint.
Losses: Because the degree of coupling is not major (i.e., typically 15%) for
"closely" coupled traces, the bulk of the current still flows in adjacent
reference planes and the added losses are minor. In some cases, one might
prefer the added high frequency (i.e., harmonics) attenuation to soften the
edges.
I use tightly coupled trace pairs within the limits of the vendor's
manufacturing process to the maximum extent practical.
Mike
Michael L. Conn
Owner/Principal Consultant
Mikon Consulting
(408)727-5697
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