A return path in a PCB refers to the low-impedance path through which current flows back to the source after passing through a circuit component. The return current typically traverses through ground planes or adjacent conductive layers to complete the circuit loop. If the return path is poorly designed, return currents may detour, increasing the loop area and making the circuit susceptible to noise, crosstalk, or EMI, especially in high-speed digital or analog circuit designs. Factors affect...
