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I have never heard about that specification "quality"..
There is no such definition at all. They can be passive, causal, reciprocal etc. But quality is never mentioned
We use S parameters to analyze a PCB channel. Once the S parameters are extracted, what I have seen is SI engineers will check the S parameters obtained are passive and casual.
I have some questions about it.
A PCB channel consists of copper traces. The trace has some resistance, capacitance and inductance. May I know in any case will this trace become an active element.
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