PCB multilayer circuit board is a basic component often used in modern electronic manufacturing, which can connect electronic components with circuits. Compared with single-sided and double-sided circuit boards, multilayer circuit boards have higher density and smaller volume, and under the same circuit complexity, the circuit board area is smaller, which is suitable for occasions that require tight space in the electronics manufacturing industry. This article will introduce PCB multilayer circuit boards in detail from four aspects.
First, the type of multilayer circuit board.
Multilayer circuit board refers to an electronic component formed by stacking multiple conductive layers on the substrate. Depending on the number of layers, multilayer circuit boards can be divided into 4 layers, 6 layers, 8 layers and other types. The 4-layer circuit board is suitable for general electronic products, the 6-layer circuit board is suitable for medium-complexity electronic products, and the 8-layer and above circuit boards are suitable for high-performance and high-density electronic products. Each species has its own unique characteristics and application scenarios.
Second, the role of multi-layer circuit boards.
1) Improve the density of the circuit: The multi-layer circuit board can greatly improve the density of the circuit by arranging wires and connecting holes between different layers, so that more electronic components can be integrated on a board, so as to achieve smaller size and higher performance electronic products.
2) Reduce electromagnetic interference: multi-layer circuit boards can effectively reduce the impact of electromagnetic interference, through the reasonable design of interlayer leads and interlayer power planes, can reduce the crosstalk and mutual interference between signals, and improve the stability and reliability of the system.
3) Enhance signal integrity: In the process of wiring, the multi-layer circuit board can adopt the method of stratum segmentation, signal layer segmentation and power layer segmentation to effectively control the transmission path of the signal and the reflow path of the signal, so as to improve the integrity of the signal and the anti-interference ability.
4) Realize functional integration: multi-layer circuit boards can integrate different functional modules together, and realize the integration and collaborative work of functions through interlayer connection and signal transmission, so as to improve the overall performance and work efficiency of the system.
3. The manufacturing process of multi-layer circuit boards.
1) Interlayer connection technology: In the manufacturing process of multilayer circuit boards, it is necessary to connect the wires between different layers through interlayer connection technology. Commonly used interlayer connection techniques include blind, buried, and film vias, which enable signal transmission and power between different layers**.
2) Stacking method: The stacking method of multilayer circuit board can be divided into two types: symmetrical stacking and asymmetrical stacking. Symmetrical stacking means that each layer has the same structure and wiring rules, which is suitable for some electronic products with high symmetry requirementsAsymmetrical stacking refers to the fact that the structure and routing rules between different layers are not exactly the same, which is suitable for some special functional requirements.
3) Material selection: The material selection of multilayer circuit boards has an important impact on its performance and reliability. Commonly used materials include FR4, high-frequency sheets, polyimides, etc., different materials have different electrical conductivity, thermal conductivity and mechanical strength, and the right material can be selected according to specific needs.
Fourth, the application field of multilayer circuit board.
Multilayer circuit boards are widely used in electronic products in various fields, including communication equipment, computer hardware, industrial control, etc. In communication equipment, multilayer circuit boards can realize large-capacity data transmission and high-speed signal processingIn computer hardware, multilayer circuit boards can implement complex data storage and processing functions;In industrial control, multi-layer circuit boards can realize functions such as automatic control and precision measurement.
Multilayer circuit boards play an important role in modern electronic products, and circuit boards with different layers are suitable for different scenarios and needs. With the continuous development of science and technology, the application of multilayer circuit boards in various fields will become more and more extensive.