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Re: [Xylo-SDR] LVDS buss topologies

----- Original Message ----- From: "KD5NWA" <kd5nwa@cox.net>
To: "Xylo-SDR Discussion" <xylo-sdr@lists.ae5k.us>
Sent: Wednesday, February 22, 2006 7:00 PM
Subject: Re: [Xylo-SDR] LVDS buss topologies

If you treat is as a transmission line with proper impedance of the
line and termination and you will be OK. Keep the stubs short.

Designing the proper impedance using trances in a PCB is hairy,
because different manufactures use boards with different dielectric
constants making it tough to keep the SWR constant, unless you limit
yourself to a particular board.

The variation in DC won't make much difference, variations in track width in the etching process will probably have a greater effect. FR4 is generally used for this sort of application in much more critical systems than ours. The calculations are quite straightforward, anyway, so we could check my assumption by taking a few manufacturers figures for their material.and calculating the effect.

73, Leon