Many customers often ask: What are the common problems encountered in PCB circuit board design? Let professional PCB manufacturers tell you below.

　　1. Why do we try not to split across power sources when wiring?

　　Because the signal spans different power layers, its return path becomes longer and more susceptible to interference. Of course, low-speed signals are acceptable, but high-speed signals should be carefully checked and avoided crossing as much as possible.

　　2. Some boards may have external input and output interfaces, and if their grounding design is not good, it can also affect normal operation and become a source of external electromagnetic interference, sending out the noise inside the board. Generally speaking, a separate interface ground will be separated and connected to the signal ground through thin wiring, which can be connected in series with a resistance of 0 ohms or a small resistance value.

　　Common grounding symbols: PE, PGND, FG - protective grounding or casing; GND - workplace; DGND - Digital Ground; AGND - simulated ground; LGND - Lightning protection ground.