Does TDR impedance has any relation with track length
Below behavior is seen in 90ohms trace routed with constant trace width & separation,
Please let me know if there is any reason for this behavior
Yes, the trace has DC resistance and additional resistance from skin effect and, eventually, surface roughness. This loss is proportional to the length of trace. The effective impedance shown by a TDR has the characteristic impedance plus the length-dependent resistance building up over the trace length.
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