[SI-LIST] Re: On the effect of solder mask on Zo
- From: "Abe Riazi" <ariazi@xxxxxxxxxxxxxxx>
- To: "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 13 Feb 2004 13:13:11 -0800
Scott McMorrow Wrote:
>
>
>
Soldermask is not the
limiting factor for impedance control of FR4 PCBs, but it does tend to
increase trace impedance slightly, as Dr Bogatin points out.
>
>
>
Dear Scott:
Based on the article by Dr. Bogatin ( "When Accuracy Counts" Printed
Circuit
Design & Manufacture", May 2003, P. 36 ), and also my own analyses,
the soldermask effect is to "decrease" the trace impedance.
Best Regards,
Abe
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