Re: [SI-LIST] : MECL System Design Handbook

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From: Mike Jenkins (jenkins@lsil.com)
Date: Thu May 10 2001 - 14:32:00 PDT


Tom,

If a right angled trace does cause a discontinuity, I doubt it is
due to just the extra capacitance, which is in the order of one or
two femtofarads. It probably has more to do with the physics of
making an E/M wave make the turn.

Regards,
Mike

> "Dagostino, Tom" wrote:
>
> If you look at the cross section of the trace at the bend it gets
> wider. A wider trace has more C per unit length. More C will look
> like a lower Zo. I've seen dips in impedance TDR'ing right angles.
>
> Tom Dagostino
> IBIS and Tau Modeling Manager
> SDD
> Mentor Graphics Corp.
> 503-685-1613
> tom_dagostino@mentor.com
>
...

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