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Here 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.
Downstream operators usually require PCB manufacturers to do 100% electrical testing, so they will agree with PCB manufacturers on test conditions and test methods. Therefore, both parties will clearly define the following:
Each VXI bus device has a set of “configuration registers”. The system main controller reads some of the basic configuration information of the VXI bus device by reading the contents of these registers, such as device type, model, manufacturer, and address space (A16, A24). , A32) and the required storage space.
The following is an introduction to the testing experience and methods of resistors.
The Micro-Electro-Mechanical System (MOEMS) is an emerging technology that has recently become one of the hottest technologies in the world. MOEMS is a micro-electro-mechanical system (MEMS) that uses an optical subsystem. It contains micro-mechanical light modulators, micro-mechanical optical switches, ICs, and other components, and utilizes the miniaturization, multiplicity, and microelectronics of MEMS technology. Seamless integration of optical devices and electrical devices. Simply put, MOEMS is a further integration of system-level chips. Compared with large-scale opto-mechanical devices, PCB design MOEMS devices are smaller, lighter, and faster (having a higher resonant frequency) and can use mass production techniques. Compared with the waveguide mode, this free space mode has the advantages of lower coupling loss and smaller crosstalk. The changes in photonics and information technology directly promote the development of MOEMS. Figure 1 shows the relationship between microelectronics, micromechanics, optoelectronics, fiber optics, MEMS and MOEMS. Nowadays, information technology is rapidly developing and constantly updated. By 2010, the speed of light can reach Tb/s. The ever-increasing data rate and the demand for higher-performance next-generation devices have driven the demand for MOEMS and optical interconnects, and the application of PCB design MOEMS devices in the field of optoelectronics continues to grow.
In high speed designs, the characteristic impedance of the controllable impedance plates and lines is one of the most important and common problems. First, let's look at the definition of a transmission line: a transmission line consists of two conductors of a certain length, one for transmitting signals and the other for receiving signals (remember that the "loop" replaces the concept of "ground"). In a multi-layer board, each line is part of a transmission line, and an adjacent reference plane can be used as a second line or loop. The key to a line becoming a "good performance" transmission line is to keep its characteristic impedance constant throughout the line.
To popularize LED lamps, it is necessary not only to significantly reduce costs but also to solve technical problems. How to solve the problems of energy efficiency and reliability, Doug Bailey, vice president of marketing for Power Integrations, shared the experience of efficient and reliable LED driver design.
Especially for beginners, it is necessary to master the testing methods and experience of common components.
Design requirements: The designer must read the schematic diagram in detail, fully communicate with the project engineer, understand the circuit architecture, understand the working principle of the circuit, and clearly understand the layout and routing requirements of key signals.
For the impact of the transmission line problem, we will talk about the ways to control these effects from the following aspects.
There are many English abbreviations in the field of electrical interference.
With the development of integrated circuit process technology, the operation speed of multi-chip components is getting higher and higher, and the processing of high-speed signals has become the key to the success of MCM circuit design. When the rising or falling edge of the clock signal is small, the transmission line effect is caused, that is, signal integrity problems occur.
Multi-layer and double-sided PCB design is similar, and even easier.
Whether the wiring of a printed board can be completed smoothly depends mainly on the layout, and the higher the density of the wiring, the more important the layout. Almost every designer has encountered such a situation. When there are only a few wires left, they find that they can't be laid out anyway. They have to delete a lot or all of the wiring and re-adjust the layout! A reasonable layout is guaranteed. The premise of wiring.
The anti-jamming measures that are not common in some literatures are detailed below. Considering the practical application, especially in the trial production of products, double panels are still widely used. The following contents are mainly for double panels.
1. EMC, EMI. 2. Routing skills for high-speed differential signals
There are two ways to route: automatic routing and interactive wiring.
PCB Best Design Methodology: Six things to consider when passing a PCB schematic to a layout design. All examples mentioned in this article were developed using the Multisim design environment, but the same concepts apply when using different EDA tools.
This is a big problem. We set aside other factors, just the PCB design aspects, share the following experience for reference exchange:
Through the calculation and analysis of signal integrity to find the solution space of the design, and finally on the basis of the solution space to complete the PCB board design and verification.
In the design of electronic systems, in order to avoid detours and save time, the anti-interference requirements should be fully considered and avoided, and remedial measures against interference should be avoided after the design is completed. There are three basic elements that form interference:
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