PCB assembly china Electromagnetic Compatibility Design

The electromagnetic compatibility of pcba assembly refers to the ability of electronic devices to work in a coordinated and effective manner in various electromagnetic environments. The purpose of electromagnetic compatibility design is to enable electronic devices to suppress various external interferences, enabling them to operate normally in specific electromagnetic environments, while reducing the electromagnetic interference of electronic devices themselves on other electronic devices.

1. Choose a reasonable wire width for pcba assembly. Due to the impact interference caused by transient currents on printed lines, which is mainly caused by the inductance component of printed wires, the inductance of printed wires should be minimized as much as possible. The inductance of printed conductors is proportional to their length and inversely proportional to their width, so short and precise conductors are beneficial for suppressing interference. The signal lines of clock leads, row drivers, or bus drivers often carry large transient currents, and printed conductors should be as short as possible. For discrete component circuits, a printed wire width of around 1.5mm can fully meet the requirements; For integrated circuits, the width of printed conductors can be selected between 0.2-1.0mm.

2. Adopting the correct wiring strategy for PCB assembly china can reduce wire inductance by using equal routing, but the mutual inductance and distributed capacitance between wires increase. If the layout allows, it is best to use a cross shaped mesh wiring structure. The specific method is to horizontally route one side of the printed board and vertically route the other side, and then connect them with metalized holes at the cross holes. In order to suppress crosstalk between printed circuit board wires, long-distance equal routing should be avoided as much as possible when designing wiring, and the distance between wires should be widened as much as possible. Signal wires, ground wires, and power wires should not intersect as much as possible. Setting a grounded printed line between some signal lines that are highly sensitive to interference can effectively suppress crosstalk.

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