RE: [SI-LIST] : Coplanar Transmission Line

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From: Alfredo Moncayo (alfredo@growthnetworks.com)
Date: Thu Feb 03 2000 - 12:22:45 PST


The memory subsystem of the Nintendo 64 was implemented entirely
as a coplanar waveguide. This was done to facilitate a two-layer
PCB design. Such structures work best with peripheral leaded
packages and in-line contact connector systems. The ideal common
mode signal assignment is S-G-S-G-S-... Impedance control can
generally be quite good for two reasons: 1) there is negligible
effect due to dielectric spacing to a reference plane, 2) to
achieve 50ish ohm impedance, the trace width will be somewhat
wider than most folks are used to, making the variation of
impedance due to etching less severe.

- Alfredo

> Who out there has worked with coplanar (waveguide-like)
> transmission lines as
> opposed to stripline/microstripline?

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