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support@nextpcb.comHere you'll find insights into PCB design, tech trends, assembly issues, and trending topics
in the general news media as they relate to printed circuit board technology.
As experts in the manufacture and assembly of printed circuit boards, we work to make our blog a helpful resource on PCB topics and the industries that we work with, including automotive, consumer electronics, aerospace and many more.
At present, electronic equipment is used in various electronic devices and systems, and printed circuit boards are still the main assembly method. Practice has proved that even if the schematic design of the circuit is correct and the printed circuit board is not properly designed, it will adversely affect the reliability of the electronic device. For example, if the two thin parallel lines of the printed board are in close proximity, a delay in the signal waveform is formed, and reflected noise is formed at the end of the transmission line. Therefore, when designing a printed circuit board, care should be taken to use the correct method.
People think that the earth can absorb all the charges, always maintain a stable, is the ultimate reference point. Although some boards are not connected to the earth, but the power plant is connected to the earth, the power of the board will eventually return to the power plant into the ground.
Such as skin effect and dielectric loss, effects of vias and connectors, differential signaling and routing considerations, power distribution and EMI control.
26. When there are multiple digital/analog function blocks in a PCB board, the conventional practice is to separate the digital/analog grounds. What are the reasons?
The design performance of multi-layer boards is mostly similar to single-panel or double-panel, which is to avoid avoiding too many circuits to fill too small space, resulting in impractical tolerances, high inner layer capacity, and possibly even dangerous products. Quality safety. Therefore, the performance specification should consider the complete evaluation of the thermal shock, insulation resistance, welding resistance, etc. of the inner layer. The following sections describe important factors that should be considered in the design of multilayer boards.
One of the two necessary conditions for data transmission: the data at the input of RECEIVER generally has the required setup time Tsetup, which means that the data must be valid before the minimum time valid for the clock, and the time at which the data signal arrives at the input should be early enough. At the clock signal, the inequality satisfied by the settling time can be derived.
There are many ways to solve EMI problems. Modern EMI suppression methods include using EMI suppression coatings, selecting appropriate EMI suppression parts, and EMI simulation design. This article starts with the most basic PCB layout and discusses the role of PCB layered stacks in controlling EMI radiation and design techniques.
For digital circuit designers, the inductance of the via is more important than the capacitance. Each via has a parasitic mid-inductance. Because the physical structure of the via is small, its characteristics are very lumped lumped circuit components. The main effect of the series inductance of the via is to reduce the effectiveness of the power supply bypass capacitor, which will make the overall power supply filtering effect worse.
The higher the sensitivity of electronic equipment, which requires more and more anti-interference ability of the equipment, PCB design becomes more difficult, how to improve the anti-interference ability of the PCB has become one of the key issues that many engineers are concerned about. This article describes some tips for reducing noise and electromagnetic interference in PCB designs.
The range of variations in characteristic impedance control must consider four factors:
The increase in the functionality of the mobile phone requires higher design of the PCB.
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I remember just to work the first half, my main job is to draw the pin board.
At first glance, the PCB is similar in appearance regardless of its inherent quality. It is through the surface that we see the differences that are critical to the durability and functionality of the PCB throughout its lifetime.
There are many English abbreviations in the field of electrical interference.
Via is one of the important components of a multi-layer PCB. The cost of drilling is usually 30% to 40% of the cost of PCB board. Simply put, each hole in the PCB can be called a via. From the perspective of function, the vias can be divided into two categories:
The differential signal pairs with very close wirings are also closely coupled to each other. This mutual coupling reduces EMI emissions. The main disadvantage of differential signal lines is the increased PCB area. This paper introduces the circuit board design process. Wiring strategy for differential signal line routing.
Since the printed circuit board is not a general end product, the definition of the name is slightly confusing. For example, the motherboard for the personal computer is called the motherboard and cannot be directly called the circuit board. Although there is a circuit board in the motherboard, It's not the same, so when you evaluate the industry, you can't say the same thing. For example, because there are integrated circuit parts on the board, the news media called him an IC board, but in fact he is not equivalent to a printed circuit board.
Wireless signals are an integral part of many embedded systems today, and manufacturers of mobile terminals are discussing media convergence, where consumers can browse the web or watch the game in a notebook, mobile phone, portable digital TV or PDA.
As device operating frequencies become higher and higher, the signal integrity issues faced by high-speed PCB design become a bottleneck in traditional design, and engineers face increasing challenges in designing complete solutions. Although the high-speed simulation tools and interconnect tools can help designers solve some of the problems, high-speed PCB design requires more experience and deep communication between the industry.
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