General circuit board structure design and process manufacturing requirements are very high, the higher the number of layers is more difficult. Suitable for more complex circuits. What are the advantages of using circuit boards? Let's learn together

The advantages of using circuit boards are: high assembly density, small size; The connection between electronic components is shortened, and the signal transmission speed is improved; Convenient wiring; For high frequency circuit, ground layer is added to make signal line form constant low impedance to ground; Good shielding effect. However, the more layers, the higher the cost, the longer the processing cycle, and the more difficult the quality inspection.

In addition, from the perspective of cost, although the cost of multilayer circuit boards is higher than that of single-layer circuit boards when comparing the cost of the same area, the cost difference between multilayer 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. Although multiple layers in batches will affect the cost per unit area of the circuit board, there will not be 4 times the price difference. If more than 4 times the price difference occurs, as long as we can try to reduce the use area of the circuit board and try to reduce it to less than 1/4 of the double-sided board.

Our common computer boards usually use four or six layers of circuit boards, but now there are more than 100 layers of practical printed circuit boards. The difference between the six layer circuit board and the four layer circuit board is in the middle, that is, two internal signal layers are added between the ground layer and the power layer, which is thicker than the four layer circuit board.

Multilayer circuit board is actually formed by laminating and bonding several etched single panel or double-sided circuit boards. The double-sided circuit board is easy to distinguish. When looking at the light, except for the wiring on both sides, other places are transparent. For the four layer circuit board and the six layer circuit board, because the layers in the circuit board are closely combined, if there are corresponding marks on the board, there is no good way to distinguish them.

For a simple circuit such as a radio, it is OK to use a single-sided circuit board or a double-sided circuit board to make it. However, with the development of microelectronics technology, the complexity of circuits has been greatly improved, which also puts forward higher requirements for the electrical performance of circuit boards. If single or double sided circuit boards are also used, the circuit volume will be large, which also brings great difficulties to the wiring. In addition, the electromagnetic interference between circuits is not easy to deal with, Then there are multi-layer circuit boards (the number of layers represents several independent wiring layers, usually even).

Multilayer circuit board manufacturers have three or more layers of conductor patterns for multilayer printed circuit boards. The conductor layer can be divided into inner layer and outer layer. The inner layer is a conductor pattern completely clamped inside the multilayer circuit board; The outer layer is the conductor pattern on the surface of the multilayer board. Generally, the inner conductor pattern is processed first during production, and then the hole and outer conductor pattern are processed after pressing. The inner and outer layers are connected by metallized holes.