[SI-LIST] AW: Re: Impact on Copper Thieving on 10G Routing
- From: "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>
- To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 7 Mar 2014 15:43:16 +0000
I've been told that thieving serves multiple purposes:
- it improves etching tolerances across the panel
- on inner Layers it improves PCB thickness variances after pressing (and thus
improves impedance control)
- on outer Layers plating is improved (important for Microstrop impedance
control)
- lowers amount of useless etching
I base the decision when to use thieving on the copper fill of each Layer. The
more unused area is free of copper, the more likely it will be that I will add
thieving on this layer. Tight impedance control and material parameters also
play into role.
BR
Gert
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-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
Auftrag von Loyer, Jeff
Gesendet: Freitag, 7. März 2014 16:29
An: sij99@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] Re: Impact on Copper Thieving on 10G Routing
As far as I know, thieving is placed so far away from traces that its effects
are insignificant. The exception I've seen has been where they put thieving on
dual stripline layers, but that is an egregious error. If in doubt, you
should call out "thieving keepout" areas in your design.
Note: though thieving is primarily a plating aid (as I understand it), I have
seen many vendors put thieving on inner layers. I would appreciate anyone's
informed insight into why it's sometimes used on inner layers, and sometimes
not. I suspect it's to reduce the amount of useless etching, but haven't been
able to get a definitive explanation.
Jeff Loyer
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Jack Si
Sent: Thursday, March 06, 2014 11:54 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Impact on Copper Thieving on 10G Routing
Hi Experts,
What are the major impact created by Copper Thieving in the 10G signals and the
precautions to avoid it.
Thanks and Regards,
Jack
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