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Multi-layer circuit board-considerations for multi-layer circuit board design

Multi-layer circuit board-considerations for multi-layer circuit board design

  • Categories:Industry News
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  • Time of issue:2020-07-13 11:34
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Multi-layer circuit board-considerations for multi-layer circuit board design

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Nowadays, electronic technology is more and more developed. Products such as routers, mobile phones, switches, and base stations are all high-speed signals, which are susceptible to interference and crosstalk. In order to ensure the integrity requirements of high-speed signals, a reasonable design of multi-layer circuit boards can effectively improve the integrity of the signal and reduce the degree of signal interference to an extremely low level.

 

The design of multi-layer circuit boards is a necessary skill for hardware engineers. Knowing some basic concepts related to multi-layer circuit boards is a requirement for an excellent hardware engineer, so as to be able to grasp the core points in the specific design process . When designing a multi-layer circuit board, you need to pay special attention to the layer design, that is, how the signal lines, power lines, ground, and control lines are divided into each layer. The general principle is that the analog signal and analog signal ground must be at least a separate layer, and a separate layer is also recommended for the power supply.

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The general principle of layer arrangement of multi-layer circuit boards:

1. When designing a multi-layer circuit board, the first thing to pay attention to is the distribution of each layer, which is directly related to the performance of the product;

2. The bottom of the device surface (the second layer) is the ground plane, which provides a device shielding layer and a reference plane for the wiring of the device surface;

3. All signal layers are as close as possible to the ground plane;

4. Try to avoid the two signal layers of multilayer circuit boards directly adjacent to each other;

5. The main power supply is as close as possible to it correspondingly;

6. In principle, a symmetrical structure design should be adopted. The meaning of symmetry includes: the thickness and type of the dielectric layer, the thickness of the copper foil, and the pattern;

7. Symmetry of distribution type of multilayer circuit board (large copper foil layer, circuit layer).

 

Keyword:

The evaluation system of the circuit board factory should follow the following principles

The evaluation system of the circuit board factory should follow the following principles

Establishing a good cooperative relationship with circuit board factories is conducive to cost reduction, response time reduction and the creation of new market value, etc. The core issue is how to choose the ideal circuit board factory. There are many factors involved in the evaluation of circuit board factories, and the evaluation index systems are diverse, both qualitative and quantitative, and the index weights are also different. Therefore, it is necessary to establish a universal and expandable evaluation index system for circuit board factories. , And the indicator system should follow the following principles:
The use of soft and hard circuit boards?

The use of soft and hard circuit boards?

In our daily life, circuit boards are mostly single-sided, double-sided, or multi-layer boards, rigid boards, metal-based circuit boards, aluminum, copper substrates, thermally conductive fiberboards, etc., do you know what a flexible and rigid circuit board is? Rigid-flex circuit board: refers to a special circuit board made by pressing a rigid circuit board (PCB) and a flexible circuit board (FPC). The main board materials used are rigid board FR4 and flexible board polyimide (PI). Rigid and flexible circuit boards combine the rigid characteristics of rigid circuit boards and the advantages of flexible circuit
Soft and hard circuit board production process

Soft and hard circuit board production process

The flexible and hard circuit board is the flexible circuit board and the rigid circuit board. After pressing and other processes, they are combined according to the relevant process requirements to form a circuit board with FPC characteristics and PCB characteristics. In the past, two hard boards were connected by using soft boards and connectors to connect each other. In order to improve the reliability of the connection between the rigid board and the flexible board, the flexible board is directly fabricated between two rigid boards in the printed circuit board (PCB) factory, which can avoid the subsequent connection process, whether it is a rigid board manufacturer or FPC manufacturers are now able to supply rigid-flex boards. Under the demand for light and thin end products, the

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