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Flex circuits are suitable for very short runs, but it is difficult to shield them. They can be used as interconnects between boards within a system. If flex circuits are used, a system design engineer should closely couple the members of differential pairs where (S < W). Do not run signal pairs near the edges of the cable, as these are not balanced. Use a ground plane to establish the impedance. Use ground shield traces between the pairs if there is room. Connect these ground traces to the ground plane through vias at frequent intervals.
PTM Published on: 2011-10-13
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