How to prevent crosstalk when multiple interfaces of an electrical force measurement switch (PMS) coexist?

PMS (Power Management Systems) often integrate multiple interfaces (power supply, RS485, CAN, Ethernet, analog input/output). These interfaces coexist in a confined space, and crosstalk can occur through spatial radiation, power coupling, or ground coupling, causing analog signal jumps during communication. Preventing crosstalk requires addressing spatial isolation, frequency planning, and power supply partitioning. Spatially, different types of interface modules should be physically separated during PCB layout, isolated by ground planes or shielding covers. Interface connectors should also be distributed across the chassis.

Frequency planning: The operating frequencies of potential interference sources (such as switching power supplies) should be staggered from the operating frequencies and harmonics of sensitive interfaces (such as communication interfaces). Power supply partitioning: Independent power rails should be provided for digital, analog, and communication interfaces, isolated using ferrite beads (such as PBZ1608E600Z0T). Grounding: Star grounding or zoned grounding should be used to reduce common impedance. Cable management: Different types of cables should be laid in separate channels within the cabinet, maintaining distance. Through comprehensive design, crosstalk between interfaces can be suppressed to below -60dB, ensuring independent and stable operation of each interface.