I have a 6 layer board where layer 2 and layer 5 are ground and power plane other layers i.e, layer 1,3,4,6 are conducting layers. While routing on the top layer the impedance is calculated taking the reference of layer 2 as it is a ground layer though Impedance calculation happens based on stack-up and materials used in each layer but for inner layers layer 3 and layer 4 how the impedance will be calculated? which layer will be considered as a reference for impedance calculation ?![]()
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