What are the characteristics of multi-layer circuit boards

Multilayer circuit boards are made by laminating and bonding several etched single-sided or double-sided boards. Then, compared with single-layer and double-layer circuit boards, what are the characteristics of multi-layer circuit boards?

1. The multi-layer circuit board has high assembly density and small volume.

2. The multi-layer circuit board is convenient for wiring, and the wiring length and the connection between components are shortened, which is beneficial to improve the speed of signal transmission.

3. For high-frequency circuits, after adding the ground layer, the signal line forms a constant low impedance to the ground layer, the circuit impedance is greatly reduced, and the shielding effect is better.

4. For electronic products with high requirements for heat dissipation, multi-layer circuit boards can be provided with a metal core heat dissipation layer to meet the needs of special functions such as shielding and heat dissipation.

5. In terms of performance, multi-layer circuit boards are better than single and double-sided boards, but the higher the number of layers, the greater the production cost, the longer the processing time, and the more complicated the quality inspection.

6. Four or six-layer boards are common in multi-layer circuit boards. The difference between a four-layer board and a six-layer board is that there are two more internal signal layers between the middle layer, the ground layer and the power layer. The four-layer board should be thicker.

In general, multi-layer circuit boards have been widely used in the production of electronic products due to their design flexibility, economic advantages, stable and reliable electrical performance and other characteristics.