Howard,

To me that seems like a left over from a manual routing job. If anything
that loop from one opto to another is becoming a ground loop which may
pick up more noise.

Seems like there is a similar track over in the next bank of optos if
there any. Is the layout of the track the same there too?

Shahid

-----Original Message-----
From: Howard McGinnis [mailto:mcginnis@E-VISIONS.COM]=20
Posted At: Saturday, February 21, 2004 4:31 AM
Subject: [EE]: Ground Plane?


I have a question regarding a "ground plane" or shield on a board that
I'm redoing. I'm questioning the functionality of the large traces on
the original board (attached). The board is an analog multiplexer card
replacing an old AVCO scanner card. The card multiplexes three signals,
HIGH, LOW and SHIELD from one connector (shown) to another connector
(not shown).

The large trace is the shield. In the picture, the actual connection is
on the solder side of the board. On the component side, this appears to
be a pseudo ground plane, going only from one optoFET to another.

The signals are essentially DC, the scanning is at a slow rate.

I'm questioning the effectiveness of these traces - are they really
going to accomplish anything in terms of noise reduction, etc?

Thanks in advance,
Howard

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