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In the process of PCB design, some engineers don’t want to lay copper on the bottom of the surface layer in order to save time. Is this the right thing to do? Is it necessary to lay copper on the surface layer of PCB? First of all, we need to be clear: it is beneficial […]

In a grounded desktop product, when the ESD contact discharge test with a test voltage of 6KV was conducted at the grounding terminal, the system was reset. In the test, try to disconnect the grounding terminal from the Y capacitor connected to the internal digital working ground, but the test result has not improved significantly. […]

In the process of PCB outsourcing design, especially in high-frequency circuit design, some irregular and abnormal phenomena caused by ground wire interference are often encountered. In this paper, the causes of interference caused by ground wire are analyzed, three types of interference caused by ground wire are introduced in detail, and solutions are put forward […]

1 Why do you want to divide digital ground and analog ground? Although it is interlinked, it is different when the distance is long. The voltage at different points of the same wire may be different, especially when the current is large. Because there is resistance in the wire, the voltage drop will occur when […]

From the continuous update and development of computers, mobile phones and other electrical products, we can see the development of PCB manufacturing industry. HDI board making is the inevitable product of PCB development and a trend of PCB making. It is different from traditional PCB and has the following obvious characteristics: 1. Laser drilling is […]

A good circuit board should not only realize the function of circuit principle, but also consider the electrical characteristics such as EMI, EMC, ESD (electrostatic discharge), signal integrity, as well as the heat dissipation of mechanical structure and high power consumption chips. On this basis, consider the beauty of the circuit board, just like artistic […]

The success or failure of ink use directly affects the overall technical requirements and quality indicators of PCB shipment. Therefore, PCB manufacturers attach great importance to the performance of ink. Besides the well-known viscosity of ink, the thixotropy of ink is often ignored by people. But it plays an important role in the effect of […]

At present, domestic PCB manufacturers that can mass produce high-level circuit boards mainly come from foreign-funded enterprises or a few domestic-funded enterprises. The production of high-level circuit boards not only requires high investment in technology and equipment, but also requires the experience accumulation of technicians and production personnel. At the same time, the customer certification […]

Multi-layer PCB is used as the “core force” in the fields of communication, medical treatment, industrial control, security, automobile, electric power, aviation, military industry, computer periphery, etc. With more and more product functions and denser lines, it is relatively difficult to produce. At present, domestic PCB manufacturers that can mass-produce multilayer circuit boards often come […]

Copper sulfate electroplating plays an extremely important role in PCB electroplating. The quality of acid copper electroplating directly affects the quality and related mechanical properties of the electroplated copper layer on PCB board, and has a certain impact on the subsequent processing. Therefore, how to control the quality of acid copper electroplating is an important […]