Printed circuit boards (PCBs), also known as printed circuit boards, are the providers of electrical connections for electronic components. Its development has been more than 100 years old; its design is mainly layout design; the main advantage of using the circuit board is to greatly reduce the wiring and assembly errors, improve the automation level and production labor rate.
Printed circuit boards can be easily divided into: single-panel, double-panel, multi-layer boards
Single panel
On the most basic PCB, the parts are concentrated on one side and the wires are concentrated on the other side. Since the wire only appears on one side, this PCB is called a single-sided. Because single-panel has many strict restrictions on the design line (because there is only one side, the wiring can not cross and must be around the path), so only the early circuit used this type of board.
Double panel
This type of circuit board has wiring on both sides, but to use the two sides of the wire, it is necessary to have appropriate circuit connections between the two sides. The "bridge" between such circuits is called a via. The via hole is a small hole filled or coated with metal on the PCB, which can be connected to the wires on both sides. Because the area of the double panel is twice as large as that of the single panel, the double panel solves the difficulty of wiring interleaving in a single panel (can pass through the via hole to the other side), and it is more suitable for circuits that are more complicated than single panels.
Multilayer board
In order to increase the area that can be wired, the multilayer board uses more single or double-sided wiring boards. Using a double-sided inner layer, two single-sided outer layers or two double-sided inner layers, two single-sided outer printed circuit boards, alternating between positioning system and insulating bonding material and conductive patterns Printed circuit boards that are interconnected according to design requirements become four-layer, six-layer printed circuit boards, also known as multi-layer printed circuit boards. The number of layers in the board does not mean that there are several separate wiring layers. In special cases, empty layers are added to control the thickness of the board. Usually the number of layers is even and the outermost two layers are included. Most of the motherboards are 4 to 8 layers of structure, but technically they can achieve nearly 100 layers of PCB. Large supercomputers mostly use quite a few motherboards, but because such computers can already be replaced by clusters of many common computers, super-multilayer boards are gradually being used. Because the layers in the PCB are tightly coupled, it is generally not easy to see the actual number, but if you look closely at the motherboard, you can still see it.
The above is the classification of printed circuit boards. Do you understand?
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