[SI-LIST] Re: Diff pair Impedance question
- From: Curt McNamara <curt.mcnamara@xxxxxxxxxxx>
- To: "scott@xxxxxxxxxxxxx" <scott@xxxxxxxxxxxxx>, "hitheshn@xxxxxxxxx" <hitheshn@xxxxxxxxx>
- Date: Thu, 17 Jan 2013 20:11:28 +0000
Yes, however the effect might not be large. For normal layer spacing, the
ground plane will largely dominate, and the adjacent ground pour will be a
small part of the impedance. You definitely want to confirm it. RF Calc
includes that configuration.
http://www.milmega.co.uk/milmega_media_centre.php
If the adjacent ground pour is important you will want stitching vias from it
to the ground plane spaced at a distance which is a fraction of the highest
frequency // shortest wavelength of interest.
Curt
Curt McNamara, M. Eng. P.E. // principal electrical engineer | electrical
engineering
Logic PD
T // 612.436-5178
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-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Scott McMorrow
Sent: Thursday, January 17, 2013 2:05 PM
To: hitheshn@xxxxxxxxx
Cc: SI-List
Subject: [SI-LIST] Re: Diff pair Impedance question
Hithesh
Technically what you have is Grounded Co-Planar Waveguide (GCPW). Yes, the
trace impedance is altered from microstrip.
--
Scott McMorrow
Teraspeed Consulting Group LLC
16 Stormy Brook Road
Falmouth, ME 04105
(401) 284-1827 Business
http://www.teraspeed.com
Teraspeed® is the registered service mark of Teraspeed Consulting Group LLC
On Thu, Jan 17, 2013 at 2:28 PM, Hithesh <hitheshn@xxxxxxxxx> wrote:
> Let's say you are routing diff pairs as Microstrips and you have
> ground pour on the top and bottom layers. Does the ground pour make
> the diff pair traces Coplanar wave guides?
> Does the CPW affect the trace impedance.
> -Hithesh
>
>
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