source:Industry News release time:2023-06-13 Article author:yu Popular:pcb
Before designing a multi -layer circuit board, the multi -layer circuit board structure used in accordance with the circuit scale, circuit board size and electromagnetic compatibility (EMC) must be determined. That is, it is decided to use 4, 6 or higher multi -layer circuit boards. Once the number of layers is determined, the multi -layer circuit board factory determines that the positioning position of the electrical layer in the multi -layer circuit board will be determined, and how to distribute different signals on these layers. This is the choice of layers of multi -layer circuit board factories.
The general principles of multi -layer circuit board layer layer layers of multi -layer circuit board factories:
1) At the bottom of the device surface (the second layer) is the ground plane, providing the device shielding layer and providing a reference plane for the device surface wiring;
2) All signal layers of multi -layer circuit boards are adjacent to the ground plane as much as possible;
3) Try to avoid the two signal layers directly adjacent;
4) The main power supply is adjacent to it as much as possible;
5) Multi -layer circuit board factories should be designed in principle. The meaning of symmetry includes: medium layer thickness and type, copper foil thickness, graphic
6) Symmetry of multi -layer circuit board distribution type (large copper foil layer, circuit layer).
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