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'[EE]: about PCB traces'
2002\02\11@133807 by David P. Harris

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I think is is a ground plane.
David

Andre Abelian wrote:

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2002\02\11@134237 by Nick Veys

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Yes, but why the funky split-and-rejoin and weird bends?

spam_OUTnickTakeThisOuTspamveys.com | http://www.veys.com/nick

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2002\02\11@134501 by David VanHorn

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At 10:30 AM 2/11/02 -0800, Andre Abelian wrote:
>Hi to all,
>
>Apologize if the tag isn't right.
>Friend of mine sent me a picture of this attached board
>that I couldn't recognize the purpose of traces being like that.
>The board is hatched by very specific way
>Any idea why traces are like that? Is it for RF?

Interesting. Many parallel traces have lower inductance than the same width
in a single trace.  The bonding, and "z" bends are puzzling though. That
looks to add inductance.

There's a lot of vias, which I suspect mean that there's a lot of high
frequency current flowing, and they want to bond upper and lower ground
planes.

I've seen traces snaked to add inductance, but I've never seen one like
this before!

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2002\02\11@134914 by Gordon Varney

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I have never seen this technique before. I first thought of thermal relief. Then I noticed the large copper areas just
to the right. I use Microstripping techniques all the time and I have never read about this type of Striplining. It
could be shielding or absorption concepts. My guess would be capacitive elements and series inductance in a run to
reduce the coupling of EMI/RFI type interference.

Gordon Varney
http://www.iamnee.com



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2002\02\11@140128 by David VanHorn

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At 12:47 PM 2/11/02 -0600, Gordon Varney wrote:
>I have never seen this technique before. I first thought of thermal
>relief. Then I noticed the large copper areas just
>to the right. I use Microstripping techniques all the time and I have
>never read about this type of Striplining. It
>could be shielding or absorption concepts. My guess would be capacitive
>elements and series inductance in a run to
>reduce the coupling of EMI/RFI type interference.

I was thinking on this some more..

It looks like the Z-bends are the best way to get around other things, and
keep the trace inductance minimized.
Apparently, they couldn't route the whole herd around the corners, so they
made more or less a summing junction, then took off from there, with the
max number of traces that they could fit around the bends, then re-summed,
and carried on with whatever number of tracks would fit in the new space.

Looks to me that this trace is VERY sensitive to inductance, and I would
seriously look at the design to see if this is really necessary!  Usually,
when you get pushed this hard, you're doing something wrong.

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2002\02\11@140251 by Don Holtz

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Could it be similar to laminations in a transformer core?  To stop magnetic a field (perpendicular to board) from inducing circulating currents in the board.

It might also be some kind of strip line filter.

What is the board from?  We might be able to tell from context?

Cheers,
Don


At 12:40 PM 2/11/02 -0600, you wrote:
>Yes, but why the funky split-and-rejoin and weird bends?
>
>.....nickKILLspamspam.....veys.com | http://www.veys.com/nick
>
>> {Original Message removed}

2002\02\11@140949 by Dal Wheeler

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Maybe its just something to make a would be reverse engineer go "huh?"  Is
this some kind of a high frequency device?
----- Original Message -----
From: Nick Veys <EraseMEnickspam_OUTspamTakeThisOuTVEYS.COM>



> Yes, but why the funky split-and-rejoin and weird bends?

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2002\02\11@145540 by Jinx

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> Any idea why traces are like that ?

Did the person who drew the board have a lazy afternoon and
just threw in some patterns ?

Or did they just not have a clue what they were doing ?

Ditto for whatever routing software was used

Are the patterns part of the design for another board, which
on this model are unused and shorted at various points ?

How many of them are part of the supply lines / ground plane ?

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2002\02\11@151629 by Mahmood Elnasser

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-----Original Message-----
From: Jinx [joecolquittspamspam_OUTCLEAR.NET.NZ] Sent: Monday, February 11, 2002 9:55 PM
To: @spam@PICLISTKILLspamspamMITVMA.MIT.EDU
Subject: Re: [EE]: about PCB traces

>Did the person who drew the board have a lazy afternoon and
just threw in some patterns ?

that's more like it. But I can't stop admiring the pcb paterns for rf
areals, they look pretty.

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2002\02\11@152029 by Chris Loiacono

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I have an old PCB CAD tool that just won't do copper pours or fills around
corners very well. Perhaps the odd designs are that person's way around a
similar limitation.
The board looks pretty neat and clean otherwise though. Doesn't that give
the impression that the designer knew what he was doing?

Can't wait to hear what the board is from....

Chris

{Original Message removed}

2002\02\11@153310 by Jinx

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> Can't wait to hear what the board is from....

Me too, intriguing

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2002\02\12@135558 by Ian Hynes
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Original message from: Andre Abelian <KILLspamengelecKILLspamspamEARTHLINK.NET>
>
>Hi to all,
>
>Apologize if the tag isn't right.
>Friend of mine sent me a picture of this attached board
>that I couldn't recognize the purpose of traces being like that.
>The board is hatched by very specific way
>Any idea why traces are like that? Is it for RF?
>
>Andre
>
Maybe to facillitate wave soldering? ie the solder flows along the
traces?
Ian


__________________________________________________________________
Get your free Australian email account at http://www.start.com.au

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2002\02\12@162205 by Bourdon, Bruce

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I asked one of the guys I work with, he thought that it might be an attempt
to achieve impeadance matching: there may be an inner layer with signals
that line up with these traces, possibly with internal vias under the larger
copper-grouping areas.

Also note, the many separate copper traces would have lower capacitance with
an internal layer than a solid/wide ground plane would...

Taken a step further: He mentioned that he knows of one company that
actually makes coax-equivelent shielded traces by having enclosing traces on
the two adjacent layers and laser drilled plated micro-holes bonding the
enclosing layers.

Bruce.

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2002\02\12@164304 by Joris van den Heuvel

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Never seen anything like that before.

Could it be heating? I kinda looks like a car mirror heating pattern.


Regards,
Joris.


{Original Message removed}

2002\02\12@164707 by uter van ooijen & floortje hanneman

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Maybe it is a compromise between shielding and the amount of copper
involved?

Wouter

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2002\02\13@044311 by Alan B. Pearce

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For some reason this email never reached me. I assume the file was an
attachment, maybe our incoming virus grabber nabbed it without notifying me.

It sounds like the Z traces could be an attempt at adding series inductance
in power traces as a filter for noise.

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