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EMC Basics #6: Understanding circuit board "stackup"

Posted: 20 Jun 2011 ?? ?Print Version ?Bookmark and Share

Keywords:stackup? PCB? routing and placement?

After the critical circuits, we like to look at the printed circuit board (PCB) stackup. Similar to the schematic, board stackup decisions are often made prior to routing and placement, so this is a good time to look at the proposed stackup. When routing and placement are complete, a second EMC review of the board is prudent. Stackup is important for EMC.

The first stackup question is the number of layers. If it is one or two layers (no power or ground planes), this raises serious EMI serious concerns about both the layout and the technology used. With today's devices, one- or two-layer designs are usually OK for embedded controllers with clocks under 10MHz. But even here, EMI precautions must be taken.

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