I am trying to design a CAN bus node. The CAN bus shall be split-terminated with 120Ohm, 60Ohm for each line.
Therefore i tried using this paper to calculate a characteristic impedance of 60Ohm for a coplanar strip attaching the CAN-Transceiver to a Twisted Pair cable, the CAN bus medium. But somehow i cant obtain reasonable values for this setup. I reach 60Ohm only with dimensions far too small or too large for manufacturing.
What is the best approach for attaching a CAN-Transceiver to a Twisted Pair cable regarding a PCB layout?
Edit: I guess I'll go by trial and error then. But how would i solve this theoretically? With USB3.0 devices i would run into the same issue without the option of scrificing some of the signal.