How many PCBs are part of the system, and how should the ground connections between them be handled?
When connecting signals or power between different PCBs—such as sending a signal or power from Board A to Board B—it's important to remember that for every current flowing out, an equal amount must return. This is based on Kirchhoff’s Current Law. The return current will take the path of least impedance, which can lead to noise if not properly managed.
To minimize this risk, it's crucial to ensure that each interface between boards has enough ground pins allocated. This helps reduce the overall impedance of the return path and minimizes ground noise. In high-current situations, you may also want to analyze the entire current loop and adjust the grounding strategy accordingly. For example, by creating a low-impedance path at a specific location, you can direct most of the return current through that area, reducing interference with other sensitive signals.
Proper grounding between multiple PCBs is essential for maintaining signal integrity and preventing electromagnetic interference (EMI). It’s not just about connecting grounds; it's about designing the return paths carefully to ensure stability and reliability in the entire system.
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