What are the characteristics of multi-layer board applied in high-speed PCB design?

When designing a high PCB, it is common to use multi-layer boards instead of single-layer and double-layer boards.

Multilayer board has many characteristics that single layer board and double layer board do not have, that‘s why high-speed PCB design use multilayer board rather than other boards.

The following is the characteristics of the multi-layer board!

1. Power supply is very stable;
2. Circuit impedance is greatly reduced;
3. The wiring length is greatly shortened.

In addition, for saving the cost, although the cost of multilayer circuit board is higher than that of single-layer circuit board, the cost difference between multilayer circuit board and single-layer circuit board is not as high as expected if other factors such as miniaturization of circuit board and convenience of noise reduction are taken into account. According to the data we know, when we simply calculate the area cost of the circuit board, the area of the double-layer circuit board can be purchased per yuan per day is about 462mm2, and the area of the four-layer circuit board is 26mm2. That is, if the area of the four-layer circuit board can be reduced to 1/2 of the double-layer circuit board, the cost is the same as that of the double-layer circuit board. While batch multilayers will affect the cost per unit area of the board, there will not be a 4-fold price difference. If there is more than 4 times the price difference, as long as the use area of the circuit board as far as possible to reduce to the double board 1/4 below.