Hello,
I have some doubts about differential signals and their grounding, mostly CAN bus.
If I understand correctly, you do not need a GND wire to go with differential pair wires IF the "Absolute maximum: CANH DC voltage versus GND" is high enough. In other words, to keep common mode voltage on the differential pair in a small range, you need a GND wire. Is that correct? How to ensure that common mode voltage (CANH+CANL/2) will remain inside the specified tolerance?
And if you don't have a GND wire, then common mode EMI is not a problem?
I read some articles, but my doubt remains.
Thanks!