There are several reasons for the general copper adding:
1.EMC can shield large areas of ground or power supply copper, and some special areas, such as PGND, can play a protective role.
2.PCB process requirements. Generally in order to ensure the electroplating effect or the flatness of lamination, we will add copper on the PCB board with less wiring area.
3.The requirement of signal integrity. It will offer high frequency digital signal a complete backflow path, and reduce the DC network wiring. In addition, there are heat dissipation, special device installation requirements of copper and so on.
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