Multi-layer circuit boards are generally used in high-speed PCB design, and the multi-layer circuit board is actually made by several etched single or double circuit boards through laminating and bonding, Multi-layer PCB has many advantages over single and double-sided PCBs, especially in small-size electronic products.
Today let’s talk about the advantages of multi-layer boards, compared with single and double-sided PCBs.
- Multi-layer circuit boards have high assembly density and small size. With the size of electronic products getting smaller and smaller, higher requirements are put forward on the electrical properties of PCB, and the demand for multi-layer printed circuit boards is also increasing.
- The use of multi-layer circuit boards facilitates wiring and layout, the wiring length is greatly shortened, and the wiring between electronic components is shortened, which also increases the speed of signal transmission.
- For the high-frequency circuit, after adding the ground layer, the signal line will form a constant low impedance to the ground layer, the circuit impedance is greatly reduced, and the shielding effect is better.
- For electronic products with high heat dissipation requirements, a heat dissipation layer with a metal core can be designed and laid out on the multi-layer circuit, which is convenient for meeting special functions such as shielding and heat dissipation.
In terms of performance, the multi-layer PCBs are superior to single and double-sided PCBs, but if the PCB has a higher number of layers, the manufacturing cost will be also higher, and the processing and production time will become longer. In addition, it is more complicated in PCB quality inspection.
With the advancement of technology, there are now more than 100 layers of PCB boards, which are used in sophisticated aerospace instruments and medical equipment.
THE MOST COMMON IN MULTI-LAYER PCB BOARDS IS THE FOUR OR SIX LAYERS PCB.
In addition, the difference between four-layer PCB and six-layer PCB lies in the middle layer, there are two internal signal layers between the ground layer and the power layer. The six-layer board is thicker than the four-layer board.
In general, multi-layer circuit boards have been widely used in the manufacture of electronic products due to their design flexibility, economic superiority, and stable electrical reliability and performance