[SI-LIST] Silver ink usage in High Speed Flex Designs
- From: Rama Mohan Reddy Boreddy <mohan.svuce@xxxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 28 Jan 2010 20:12:18 -0800
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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