How to keep the motion controller's MC sensitive circuit away from interference sources

Keeping the sensitive circuitry of the motion controller (MC) away from interference sources is the primary principle of layout design. Sensitive circuitry includes high-precision ADCs/DACs, reference sources, analog front-ends, PLLs, etc. Interference sources include switching power supplies, motor drivers, clock generators, relays, etc. During layout, sensitive circuitry should be concentrated in a quiet corner of the PCB, maintaining maximum distance from interference sources, separated by grounding shielding strips or isolation slots. The power supply for sensitive circuitry should be independently led from the main power supply via a ferrite bead or LC filter. Its grounding should use a dedicated analog ground plane. Signal traces should be short and routed on layers with a complete ground plane reference. Crystal oscillators should be kept away from sensitive circuitry and surrounded by ground lines. If space is limited, a local metal shield can be added to the sensitive circuitry. After layout, use a near-field probe to scan and detect the electromagnetic field strength in the sensitive area, ensuring it is below acceptable levels. Functional testing should verify that the performance of the sensitive circuitry meets standards when operating from interference sources.