What distance should be maintained between high-speed signal lines around a common-mode inductor to avoid interference?

High-speed signal lines (such as clock lines, data lines, with a frequency of ≥100MHz) surrounding the common mode inductance should maintain a distance of at least 5-10cm, depending on the inductance parameters. This is because the common mode inductance generates an alternating magnetic field during operation. If the high-speed signal lines are too close, noise is easily introduced through magnetic field coupling, leading to signal integrity (SI) degradation (such as jitter and bit errors). The distance is positively correlated with the rated current of the inductance and the permeability of the magnetic core: inductances with high current or high permeability magnetic cores have stronger magnetic fields and require a greater distance (such as over 10cm); for low-power inductances, the distance can be appropriately shortened (such as 5cm). If space is limited, further isolation can be achieved through a grounded shielding layer (such as signal line grounding), but it is necessary to ensure that the shielding layer is grounded at a single point