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Impedance Terminations -What’s
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2010-01-15
吴清华
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Impedance Terminations -What’s the Value:There is a lot of confusion in the industry about
“differential impedance.” I wrote a column last August1
specifically on this topic. In hindsight I can see that the article
may have been too specific, because it looked specifically
at differential impedance, and not at impedance in
general. The article pointed out that in the case of differential
signals, a transmission line terminating resister needs to
be adjusted by a correction factor related to the coupling
between two traces. But in fact, IT IS ALWAYS TRUE
that the proper terminating resister for a transmission line
needs to be adjusted for adjacent trace coupling! Here’s
why:
“differential impedance.” I wrote a column last August1
specifically on this topic. In hindsight I can see that the article
may have been too specific, because it looked specifically
at differential impedance, and not at impedance in
general. The article pointed out that in the case of differential
signals, a transmission line terminating resister needs to
be adjusted by a correction factor related to the coupling
between two traces. But in fact, IT IS ALWAYS TRUE
that the proper terminating resister for a transmission line
needs to be adjusted for adjacent trace coupling! Here’s
why:
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