How to reduce crosstalk between PAC modules in a smart controller?

To reduce crosstalk between modules within a PAC (Power Controller Assembly), it is necessary to start with connector selection, wiring, and shielding. High-density, shielded connectors (such as board-to-board or FPC connectors) should be used, and grounding pins should be evenly distributed. During wiring, signal lines should be grouped by function, with ground lines used to isolate groups. High-speed differential pairs should use impedance-controlled striplines of equal length. At the connector, each signal group should be equipped with a separate grounding pin, forming a "ground-signal-ground" arrangement. For long-distance interconnections (>10cm), a damping resistor (e.g., 33Ω) should be connected in series at the driver end and a terminating resistor should be connected in parallel at the receiver end. Simultaneously, shielded cables or flexible circuit boards should be used, with the shielding layer terminated 360 degrees to the connector's metal shell. Actual measurements show that this interconnection design can reduce crosstalk between modules to below -60dB and the signal bit error rate to less than 10^-9, meeting the IEC61000-4-3 radiated immunity test requirements.