How to reduce internal crosstalk in motion controller MC

Reducing signal crosstalk on the internal PCB of the motion controller (MC) requires attention to layout, routing, and termination. During layout, different types of circuits should be partitioned, such as digital, analog, and power areas, separated by grounding isolation strips. High-speed signal lines, such as clock and data buses, should be kept away from sensitive analog lines; if this is not possible, they should be routed orthogonally. During routing, control the spacing between parallel traces to at least three times the trace width. Inserting grounding shields between adjacent signal lines can effectively block electric field coupling.

For critical differential pairs, maintain strict equal length and spacing, and enclose them in ground. Use a multilayer board to provide a complete ground plane for high-speed signals as a return current reference. For termination, series resistors at the driver end to mitigate edges and reduce high-frequency coupling energy. For receivers susceptible to crosstalk, a small capacitor can be connected in parallel to ground. Use simulation software to extract parasitic parameters, predict crosstalk levels, and adjust the design accordingly. During testing, inject a signal into the aggressor line and measure the induced voltage on the victim line to verify the crosstalk suppression effect.