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From: "Don K"
References: <firstname.lastname@example.org> <email@example.com>
Subject: Re: Ground loops?
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Date: Sun, 15 Sep 2002 17:00:58 GMT
"Ban" wrote in message
> The star-grounding concept originates from Audio, where a very small hum can
> be annoying, even a -60dB noise is audible.
> With digital circuits there is a large band of immunity, even if there is a
> 10mV hum on connecting lines, it will not have any impact on the function,
> so you try to bring crosstalk down with every second wire grounded etc.
Which illustrates the point that you only have to do as much as is necessary
to bring the crosstalk down below some tolerable level.
In one application I couldn't even mount bulkhead female/female SMA
connectors together on an aluminum panel because of the crosstalk.
A non-conductive panel actually worked better.
If you want the ultimate in isolation, use optical fibers for all signal I/O
and power requirements.
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