[SI-LIST] Re: Silver ink usage in High Speed Flex Designs
- From: steve weir <weirsi@xxxxxxxxxx>
- To: Rama Mohan Reddy Boreddy <mohan.svuce@xxxxxxxxxxxxxx>
- Date: Thu, 28 Jan 2010 21:04:05 -0800
Rama,
Typical resistivities of silver loaded ink are such that at common
application thicknesses it is a very effective shield from under 20MHz
to any frequency you care to go to. If the resonant structure is large,
or you have voiding problems, then you could have frequency dependent
leakage issues.
Steve.
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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Steve Weir
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