Generally, the requirements of circuit board structure design and process production are very high, and the higher the number of layers, the more difficult it is. Suitable for use in more complex circuits. So what are the advantages of using circuit boards, let's learn together

　　The advantages of using circuit boards are: high assembly density and small size; shortened connections between electronic components and increased signal transmission speed; convenient wiring; Low impedance; good shielding effect. However, the more layers, the higher the cost, the longer the processing cycle, and the more troublesome quality inspection.

　　In addition, from the perspective of cost, when comparing the cost of the same area, although the cost of a multi-layer circuit board is higher than that of a single-layer circuit board, if other factors such as the miniaturization of the circuit board and the convenience of reducing noise are taken into consideration, the multi-layer circuit board is more expensive. The cost difference between boards and single-layer boards is not as high as expected. Although multi-layer batches will affect the cost per unit area of the circuit board, there is still no 4 times price difference. If there is a price difference of more than 4 times, as long as you can try to reduce the use area of the circuit board, and try to reduce it to 1/1/2 of the double-sided board. 4 or less.

　　Our common computer boards usually use four-layer circuit boards or six-layer 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 that there are two more internal signal layers in the middle, that is, between the ground layer and the power layer, which is thicker than the four-layer circuit board.

　　PCB multilayer circuit board production

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

　　For a simple circuit like a radio, a single-sided circuit board or a double-sided circuit board can be used. However, with the development of microelectronics technology, the complexity of the circuit has been greatly improved, and higher requirements have been placed on the electrical performance of the circuit board. If a single-sided circuit board or a double-sided circuit board is also used, the circuit volume will be very large. It also brings great difficulties to the wiring. In addition, the electromagnetic interference between the lines is not easy to deal with, so a multi-layer circuit board appears (the number of layers means that there are several independent wiring layers, usually an even number) .

　　The multi-layer circuit board manufacturer has three or more layers of conductor patterns for the multi-layer printed circuit board, and the conductor layer is divided into inner layer and outer layer. The inner layer is the conductor pattern completely sandwiched inside the multilayer circuit board; the outer layer is the conductor pattern on the surface of the multilayer board. In general, the inner layer conductor pattern is processed first, and the hole and the outer layer conductor pattern are processed after pressing, and the inner and outer layers are connected by metallized holes.

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