What is the purpose and principle of adding grounding via holes near the via holes of the routing as shown in the figure? Answer: The vias of the PCB board can be classified into the following types according to their functions: 1. Signal vias (the via structure requires the minimum impact on the signal) 2. Power and ground vias (the via structure requires the via to have the minimum distributed inductance) 3. Heat dissipation vias (the via structure requires the via to have the minimum thermal resistance) The vias mentioned above are grounding type vias. The purpose of adding grounding via holes near the via holes of the routing is to provide the shortest return path for the signal. Note: The signal via at the layer change is an impedance discontinuity point, and the signal return path will be disconnected from here. In order to reduce the area surrounded by the signal return path, some ground vias must be drilled around the signal via to provide the shortest signal return path and reduce the signal\'s EMI radiation. This radiation increases significantly with the increase of the signal frequency. Below are two signal return diagrams:
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