[PCB_FORUM] Re: Is silkcreen affects the traces with impedance

Richard,
 
Solder mask and silkscreen, even in close proximity at high frequencies can 
have an effect.
Lot's of  my designs are in the 6-80 GHz range. We will use solder dams for
assembly instead of blanket solder mask. Silkscreen on active components only 
and
far, far away from RF traces and elements. These are PCB's not PWB's. 
 
General statements do not apply. The frequency's must be supplied for a proper 
answer.
 
Jerry

________________________________

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx on behalf of richard moffat
Sent: Sun 9/28/2008 5:43 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Is silkcreen affects the traces with impedance




Hi

The silkscreen will have little effect unless you have the silkscreen 
absolutely plastered over everything.  Even then it will not lower it very much 
at all.  Bits of text or lines will have no measurable effect.  Soldermask will 
most likely lower it more, by 1-2 ohms say (depending on the type of mask.)

Cheers,
Richard

__________________________
Richard Moffat
PCB Specialist Engineer
Allied Telesis Labs
ph. +64 (3) 3393000
richard.moffat@xxxxxxxxxxxxxxxxxxx


>>> "malou teoxon" <malou.teoxon@xxxxxxxxx> 26/09/2008 8:27 p.m. >>>
Hi friends

I have a question here. Do you have any idea if the silkscreen on  top of
traces with impedance affects the impedance matching of that traces.

Regards
Marie.

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