[SI-LIST] Impedence of Differential Pair Not Over Plane (Revised)
- From: "Ray Gordon" <ray@xxxxxxxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Tue, 25 Jun 2002 10:46:14 +0100
Apologies for posting this twice. I made a fundamental mistake in the
original posting!
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Is there a formula for calculating differential impedence over an
(adjacent)
co-planar pair of tracks that are NOT routed over a plane layer?
I am looking for 100 Ohms (PCB is 1.6mm FR4).
As a guess (based on a 2-wire transmission line in air) I would estimate
that a track width to spacing ratio of approx 4 is required. If this is
correct then quite wide tracks will be required.
Can a reasonable transmission line be made in this manner?
Thanks for your help.
Best Regards,
Ray Gordon ray@xxxxxxxxxxxxxxxxxx
Scene Double Ltd. Tel: +44 (0)20 8386 9001
Vision House Fax: +44 (0)20 8386 9002
Station Road
Borehamwood
Herts. WD6 1DE
UK.
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