[SI-LIST] Re: Power planes
- From: "Tabatchnick, Justin" <justin.tabatchnick@xxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 24 Jul 2003 13:55:08 -0700
You are correct Ray - I thought you were talking about microstrip - in
stripline velocity is dependent on the inverse square root of the
dielectric constant .
Justin
-----Original Message-----
From: Ray Anderson [mailto:Raymond.Anderson@xxxxxxx]=20
Sent: Thursday, July 24, 2003 10:22 AM
To: si-list@xxxxxxxxxxxxx; Tabatchnick, Justin
Subject: Re: [SI-LIST] Re: Power planes
>
>Ray;
>
>Since the effective dielectric constant is a function of the reference
>ground plane distance and the trace width, ground plane distance does
>effect velocity.
>
>Justin
>Intel , Sacramento
>
Justin-
Effective dielectric constant is a weak but complex function of stack-up
geometry for microstrip lines where the fields around the line are
partly
in the air and partly in the substrate material, however for stripline=20
geometries where the substrate material is both above and below the
signal
conductor I don't believe there is that dependency.
-Ray
Sun Microsystems
Menlo Park, CA
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