2020-09-16

The adoption of the 20H rule means to ensure that the edge of the power plane is at least 20 times smaller than the edge of the 0V plane, which is equivalent to the distance between the two planes. This rule is often required as a technology to reduce the emission from the side of the 0V/power plane structure (suppressing the edge radiation effect)

2020-09-16

Parasitic capacitances exist in vias as well as parasitic inductances. In the design of high-speed digital circuits, the harm caused by the parasitic inductances of vias is often greater than the impact of parasitic capacitance. Its parasitic series inductance will weaken the contribution of the bypass capacitor and weaken the filtering effect of the entire power system.

2020-09-14

PCB is a widely used product. Almost all electronic and electrical equipment can be used, such as mobile phone, computer, automobile, display screen, air conditioner, remote control, etc., PCB will be used.

2020-09-14

一、Protel Now push the AltiumDesigner. Domestic low-end design of the mainstream, the foreign basic no one use. Easy to learn, suitable for beginners, easy to start; Occupying more system resources, higher requirements for computer configuration. People who use Protel in China still have a considerable market, after all, the hardware circuit design of small and medium-sized companies is still in the majority of low-end.

2020-09-12

Via is one of the most important parts of Multilayer PCB. The cost of drilling usually accounts for 30% to 40% of the cost of PCB production. In short, every hole on a PCB can be called a via.

2020-09-12

In the process of PCB design and production, engineers not only need to prevent PCB board from accidents in manufacturing process, but also need to avoid design errors.

2020-09-12

Via is one of the most important parts of Multilayer PCB. The cost of drilling usually accounts for 30% to 40% of the cost of PCB production. In short, every hole on a PCB can be called a via. In terms of function, vias can be divided into two types: one is used for electrical connection between layers; the other is for fixing or positioning devices.

2020-09-12

We usually need to quickly estimate the resistance of a wire or a plane on a printed circuit board, rather than make a tedious calculation. Although there are available printed circuit board layout and signal integrity calculation programs that can calculate the wiring resistance, we sometimes hope to adopt a fast and rough estimation method in the design process.

2020-09-12

With the improvement of product qualification rate, the pass through rate of product will be greatly improved. PCBA testing is a link in the whole production process of PCBA processing and an important means to control the product quality.

2020-09-12

PCBA coating should be transparent and cover PCB and components evenly. Whether the coating is uniform or not is related to the coating method to a certain extent, which will affect the appearance of printed circuit board surface and the coating condition of corners. In SMT SMT chip processing, there will be a "deposition line" of coating accumulation or a small amount of bubbles at the edge of the board, which will not affect the function and reliability of the coating.