Hi everyone,
I’m designing a PCB that includes both CAN and RS-485 interfaces. I’ve routed the differential pairs and matched the trace lengths carefully.
During the differential pair skew check, I observed that the skew is 0 throughout the entire routing except at the termination resistor connection/junction. The D+ and D− (or CANH and CANL) traces have equal overall lengths, but the skew report is still showing a mismatch only around the resistor connection area.
Is this expected behavior because the differential pair is temporarily split at the resistor pads, or is there a recommended routing technique to eliminate this skew?
