bobsun
Full Member level 2
![Full Member level 2](/styles/images/ranks/elevel2.gif)
Hello,
I would like to ask a question on impedance.
I found the following note on a PCB manufacturing file as shown in the attached picture, and reads
"5.1 mil TRACES ON LAYERS S AND 10 TO BE 55 OHM. SINGLE ended AND 100 OHM DIFFERENIIAL."
My question is:
Since it is already said to be single-ended, which means the board doesn't use differential signaling; then why there is still "100 Ohm differential" requirement? What does it refer to?
Bob
I would like to ask a question on impedance.
![89_1300639389.png](https://obrazki.elektroda.pl/89_1300639389.png)
I found the following note on a PCB manufacturing file as shown in the attached picture, and reads
"5.1 mil TRACES ON LAYERS S AND 10 TO BE 55 OHM. SINGLE ended AND 100 OHM DIFFERENIIAL."
My question is:
Since it is already said to be single-ended, which means the board doesn't use differential signaling; then why there is still "100 Ohm differential" requirement? What does it refer to?
Bob
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