How to properly wire the differential signal of a motion controller MC?

Proper routing of the motion controller's MC differential signals is fundamental to ensuring its anti-interference capability. Differential pairs must maintain strictly equal length, equal spacing, and parallel routing, with length deviations typically controlled within 5 mils. Routing should reference a complete and uninterrupted ground plane to provide consistent impedance and return paths. Differential impedance must be strictly controlled according to interface standards, such as 90Ω for USB and 100Ω for LVDS.

Routing should be as short as possible, avoiding unnecessary vias. If layer changes are necessary, a ground via should be added for each differential pair. Keep away from noise sources and board edges. At connectors, differential pairs should arrive simultaneously, and pin arrangements should be symmetrical. Termination resistors should be placed close to the receiver. For longer traces, simulations can be performed to optimize trace width, spacing, and stack-up. Verify routing compliance by measuring the eye diagram and common-mode noise of the differential signals. Proper differential routing fully leverages its common-mode rejection advantages, improving system EMC performance.