[SI-LIST] Re: Silver ink usage in High Speed Flex Designs
- From: Scott McMorrow <scott@xxxxxxxxxxxxx>
- To: Rama Mohan Reddy Boreddy <mohan.svuce@xxxxxxxxxxxxxx>
- Date: Fri, 29 Jan 2010 09:49:53 -0500
Rama
Julian Ferry and the guys at Samtec Harrisburg did some analysis and
measurement work with Silver Inks on flex a few years back. You might
ask them about it.
Scott
Rama Mohan Reddy Boreddy wrote:
> Hi Experts,
> In one of our earlier projects, we have used High Speed Flex PCBs. The
> stackup of the 3 layer Flex is like this
>
> Solder Mask
> Silver Ink
> FR4
> Layer 1 ( HDMI, SATA and USB)
> FR4
> GND
> FR4
> Layer2 (HDMI, SATA )
> FR4
> Silver Ink
> Solder mask
>
> I haven't included adhesive for the clarity. Please share your thoughts
>
> a) Does the Silver ink really required? Silver ink used to provide shielding
> for top and bottom signal layer. But when i checked the
> appliation notes, Silver Ink doesn't provide proper shielding at speed
> more than 1 GHz.
>
> Rama
>
>
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--
Scott McMorrow
Teraspeed Consulting Group LLC
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