How to eliminate pulse crosstalk in motion controllers (MC)

Eliminating crosstalk between multiple pulse signals in a motion controller (MC) requires both spatial and electrical isolation. During layout, physically separate the pulse output drive circuits for different axes. During wiring, increase the spacing between pulse lines to at least three times the line width. Insert grounded shielded wires between pulse lines. Use independent shielded twisted-pair cables for each pulse channel. Electrically, provide independent power filtering for each pulse drive, for example, by drawing power from a common power source via ferrite beads.

Using differential transmission of pulse signals can significantly reduce crosstalk sensitivity. At the receiving end, add bandpass or digital filters to each input to allow only pulses within a specific frequency range to pass. Quantify the crosstalk level by injecting a signal into one pulse line and measuring the induced voltage on the other lines. If crosstalk is severe, consider using opto-isolators to completely isolate each channel. Eliminating crosstalk is crucial for multi-axis synchronization accuracy.