The role of multilayer circuit boards
Multilayer Board is generally used for high-speed PCB designs. The multilayer wiring board is actually formed by laminating and bonding several etched single-sided or double-sided boards. Compared with single-layer or double-layer circuit boards, multi-layer circuit boards have many advantages, especially in small-volume electronic products. Let's share the advantages of multilayer circuit boards.
1. Multi-layer circuit board has high assembly density and small volume. As the volume of electronic products becomes smaller and smaller, higher requirements are put forward for the electrical performance of PCB , and the demand for multilayer circuit boards is also increasing.
2. Multi-layer circuit board is convenient for wiring, the wiring length is greatly shortened, the connection between electronic components is also shortened, and the speed of signal transmission is also improved.
3. For high-frequency circuits, after adding a ground layer, the signal line will form a constant low impedance to the ground, the circuit impedance will be greatly reduced, and the shielding effect will be better.
4. For electronic products with high heat dissipation requirements, multi-layer circuit boards can be provided with a metal core heat dissipation layer to facilitate special functions such as shielding and heat dissipation.
In terms of performance, multi-layer circuit board is better than single and double-sided boards, but the higher the number of layers, the higher the manufacturing cost, the longer the processing time, and the more complicated the quality inspection. However, under the cost comparison of the same area, the cost of multi-layer circuit board is higher than that of single-layer and double-layer, but considering the noise reduction lamp factor, the cost difference between the two is not so obvious. With the advancement of technology, there are now more than 100 line boards, which are mostly used for precision aerospace instruments and medical equipment.
common multi-layer circuit board is a 4. of six boards, common in daily life is the familiar computer. The difference between the four-layer board and the six-layer board is that there are two internal signal layers between the middle layer, the ground layer and the power layer, and the six-layer board is thicker than the four-layer board. Single board and double board are easy to distinguish, the naked eye can also distinguish. Look at the lamp with a board, except for the traces on both sides, other places are transparent. But for the four-layer board and the six-layer board, if there is no corresponding mark on the board, it is not so easy to distinguish.
In general, multilayer circuit board has been widely used in electronic product manufacturing due to its flexible design, economic advantages, stable and reliable electrical performance and other advantages.
multilayer circuit board
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Before designing multilayer circuit boards, the multilayer circuit board structure must be determined according to the circuit scale, circuit board size and electromagnetic compatibility (EMC) requirements. That is to decide whether to use a 4-layer, 6-layer or higher multilayer circuit board. Once the number of layers is determined, the multilayer circuit board factory has decided to determine the placement of the electrical layers in the multilayer circuit board and how to distribute different signals on these layers. This is the choice of multilayer circuit board factory laminated structure.
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