Analysis of the connection method of the ground wire between the boards when the PCB is composed of the system
How many PCBs form the system, and how should the ground wires between the boards be connected?
When the signal or power supply between the PCB boards is connected, for example, the A board has power or signal sent to the B board, there must be an equal amount of current flowing from the ground to the A board (this is the Kirchoff current law). The current on this formation will flow back where the impedance is the least. Therefore, at each interface where the power source or signal is connected to each other, the number of pins allocated to the ground layer should not be too small to reduce the impedance, which can reduce the noise on the ground layer. In addition, you can also analyze the entire current loop, especially the larger current, adjust the ground or ground connection to control the current travel (for example, make a low impedance somewhere, let most of the current from this Place to reduce the impact on other sensitive signals.
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