When laying out microstrip 50 Ohm single-ended or 100 Ohm differential
traces, it is OK to use the same layer as the reference for targeting
the trace impedance (if the laminate is very thick between adjacent
signal layers in a 2-layer stack up, e.g. 55 mils)? The signal traces
are routed next to ground on the same layer. I've only seen online PCB
calculators with a plane below the signal trace(s). Are there any online
calculators to compute the impedance when the ground reference is on the
same layer?
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