What is pcb board prototype A PCB prototype board is essentially an early sample of a product, with the primary purpose of testing the functionality of the design concept. Designers and engineers use different types of PCB prototypes to test various aspects of a chosen design. Although most prototypes are only meant to test basic…
In the PCB routing rules, the circuit board factory has a principle of “key signal line priority”, that is, key signals such as power supply, analog signal, high-speed signal, clock signal, differential signal and synchronization signal are routed first. Next, let’s take a closer look at the routing requirements of these key signals. Analog signal…
The most basic process of designing a circuit board can be divided into three steps: design of circuit schematics, generation of network tables, and design of printed circuit boards. Whether it is the layout of devices on the board or the routing, there are specific requirements. For example, input and output routing should be avoided…
In the PCB electronic industry soldering process, more and more manufacturers are beginning to turn their attention to selective soldering. Selective soldering can complete all solder joints at the same time, minimizing production costs, while overcoming the problem of reflow soldering affecting temperature-sensitive components. Selective soldering can also be compatible with future lead-free soldering. These…
CB multilayer board is a circuit board composed of multiple conductive layers and insulating layers stacked alternately, which is widely used in various complex electronic devices. Below we will analyze the advantages and disadvantages of PCB multilayer boards from multiple aspects. 1.Advantages of PCB multilayer board High-density integration capability PCB multilayer board allows for higher…
Formation of peak current: The current Ioh pulled from the power supply when the digital circuit outputs a high level and the current Iol injected when the digital circuit outputs a low level are generally different, that is: Iol＞Ioh. Take the TTL NAND gate in the following figure as an example to illustrate the formation…
The results of the eye diagram also show that the effect is obvious. In fact, in the process of product design, PCB wiring is often not something you can modify as you want, which involves collaboration between many aspects and departments; changing PCB materials is also very troublesome, and it can only be adjusted after…
Letting machines replace people to work is a main theme of human social development, and efforts and attempts around this vision have never stopped. In the second half of the 20th century, people introduced the concept of “automation” in industrial manufacturing, that is, using various technologies, methods and tools to minimize human intervention in the…
When you need to replace ICs in PCB circuit design, here are some tips for replacing ICs to help designers design PCB circuits more perfectly. 1.Direct replacement Direct replacement means replacing the original IC with another IC without any modification, and the replacement does not affect the main performance and indicators of the machine. The…
If the interlayer capacitance is not large enough, the electric field will be distributed over a relatively large area of the board, so that the interlayer impedance is reduced and the return current can flow back to the top layer. In this case, the field generated by this signal may interfere with the field of…
1.Manufacturing technology and structural characteristics HDI board: It is manufactured by the build-up method, and the technical level of the board is improved by continuously increasing the number of build-up layers. A large number of micro-blind buried hole technology is used, and the hole diameter is less than 150um, which improves the assembly density and…
In the application of 65W~150W output power range, CrM PFC+QR Flyback topology is a very commonly selected architecture. Under the trend of miniaturized integrated circuits, QR combo control chips came into being. In addition, for consumer electronic products, not only does energy efficiency need to meet regulatory requirements, but its standby loss is also a…
In the circuit, electronic components are divided into strong and weak. The ranking of electronic components’ resistance is as follows: Resistors, inductors, capacitors, semiconductor devices (including diodes, triodes, field tubes, integrated circuits). That is to say, under the same working conditions, semiconductor devices have the highest probability of damage. When looking for faulty components, diodes,…
DFM: Design for Manufacture DFM means design for manufacturing, Design for manufacturability, that is, starting from improving the manufacturability of parts, making parts and various processes easy to manufacture, low manufacturing cost, high efficiency, and low cost ratio. It is to fully consider the difficulties that may be encountered in the production link during the…
“Grounding” generally refers to connecting a circuit, device or system to a good conductor that serves as a reference potential point or reference potential surface, so as to establish a low-impedance channel between the circuit or system and the “ground”. The ground wire is an equipotential body that serves as the potential reference point of…