When designing high altitude circuit boards, multi-layer circuit boards are usually used instead of single-layer and double-layer circuit boards. Why is this? Today brings you the reason for using multi-layer boards for high-speed circuit boards! Let's take a look together!

　　Multi layer boards have many characteristics that are not found in single or double layer boards, and it is precisely because of these characteristics that high-speed circuit board designs use multi layer boards instead of other circuit boards. The following is a summary of the characteristics of multi-layer boards!

　　1. The power supply is very stable; 2. The circuit impedance is significantly reduced; 3. The wiring length is significantly shortened. In addition, from a cost perspective, although the cost of multi-layer circuit boards is higher than that of single-layer circuit boards, the cost difference between multi-layer circuit boards and single-layer circuit boards is not as high as expected when considering other factors such as the miniaturization of circuit boards and the convenience of noise reduction. According to the data we know, when we simply calculate the area cost of a circuit board, the area of a double-layer circuit board that can be purchased every day is about 462mm2, and the area of a four-layer circuit board is 26mm2. That is, if the usage area of a four-layer circuit board can be reduced to half of that of a double-layer circuit board, the cost is the same as that of a double-layer circuit board.

　　Although batch production of multiple layers will affect the unit area cost of circuit boards, there will not be a price difference of four times. If there is a price difference of more than 4 times, as long as the usage area of the circuit board is minimized to less than 1/4 of the double-layer board as much as possible.