[SI-LIST] Re: Spacing rules for reduction of cross talk
- From: "Istvan NOVAK" <istvan.novak@xxxxxxxxxxxxxxxx>
- To: <kedar@xxxxxxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 6 Jan 2005 08:42:19 -0500
Kedar,
> but in the calculation of the cross talk trace width is not considered
> why is it so..........?
Trace width is usually not directly included in the crosstalk
calculations, but indirectly it IS included. The backward and
forward crosstalk coefficients are both calculated from the
ratios of mutual capacitance to self capacitance and
mutual inductance to self inductance values. Implicitly, the self
capacitance and self inductance values carry the information
about trace width.
For the usual wide-aspect-ratio traces, the primary scaling rule
tells us that the characteristic impedance is driven by the ratio
of trace width and dielectric height. Similarly, the crosstalk
depends on the ratio of spacing and (any of the) trace width
or layer height. Since layout is drawn on plane layer, which
includes directly the trace width, it is more convenient to draw
the rule-of-thumb trace separation values in terms of trace width.
Best regards,
Istvan Novak
SUN Microsystems
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