Re: [SI-LIST] : What's your favourite Screwy SI Concept?

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From: Adrian Shiner ([email protected])
Date: Wed Jan 05 2000 - 11:57:35 PST

Try

The simulator says it is O'K so I will build it.

Current is a bad thing

Lower supply volatage are a good thing

Open RS232 and printer connectors do not radiate (when did you last see a
computer instruction telling you to terminate these connectors if they are
not connected to other equipment?)

Printers & VDUs do not need screened enclosures (like put metal deposit on
ALL case of the damned things). I can supply a tape recording of a printer
taken from my shortwave communications receiver fed from an active aerial as
proof).

Adrian

----- Original Message -----
From: Andrew Phillips <[email protected]>
To: SI-LIST <[email protected]>
Sent: 05 January 2000 13:17
Subject: [SI-LIST] : What's your favourite Screwy SI Concept?

>
>
> Having been following this list for several years now, and coming up
> against plenty of signal integrity issues with my work along the way - I
> always find it interesting to see how many confused or even totally
> bogus, yet often quoted, design 'philosophies' there are floating about
> in this field -
>
> e.g. connect a decoupling cap directly to the power/gnd pins of a device
> to prevent noise currents from spreading onto the power planes rather
> than dropping vias directly to the plane.
>
>
> I would be interested to hear other people's favourite 'Screwy SI
> Concept' - why its screwy and why you think it has hung around in the
> literature confusing everybody.
>
> I'll put together a summary if enough people send me stuff.
>
> Cheers,
>
> Andrew Phillips
> Supercomputing Systems AG
> Zurich, Switzerland
>
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