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Preliminary preparation—PCB structure design—PCB layout—wiring—wiring optimization and silk screen printing—network and DRC inspection and structural inspection—plate making. 1. Preliminary preparations include the preparation of component libraries and schematic diagrams“If a worker wants to be good at his work, he must first sharpen his tools.” To make a good board, in addition to designing the principles …
How to solve EMI problems in multilayer PCB designThere 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, etc. This article starts from the most basic PCB layout and discusses the role and design skills of PCB layered stacking in …
1. Abrasives abrasives, brush materialsVarious materials used to clean and pre-treat the PCB surface and brush the copper surface, such as polymer non-woven fabrics, or non-woven fabrics mixed with emery, or various types of sand-free materials, and pumice powder (Pumice Slurry), etc. Call it Abrasives. However, the powder of this kind of sandy brush material is often …
In the production of single-sided or double-sided PCBs, the non-conducting holes or conducting holes are directly drilled after blanking; the multi-layer boards are drilled after the pressing board is completed.According to the function, drilling can be divided into: part hole, tool hole, through hole, blind hole, buried hole. Conventional drilling is processed by drilling machinery. …
Online Test (ICT)ICT, that is, automatic online test, is a must-have test equipment for modern PCB manufacturers, and it is very powerful. It mainly detects open circuits, short circuits, and failures of all parts of the PCBA by contacting the test probes with the test points of the PCB layout, and clearly informs the staff.ICT has a …
Commonly used test methods for PCB manufacturing Read More »
Open the PCB design drawing on the computer, light up the short-circuited network, and see which is the closest and easiest to connect to. Pay special attention to short circuits inside the IC. If it is manual welding, it is necessary to develop a good habit: 1. Before welding, check the PCB board visually, and use a …
Detection method of PCB circuit board short circuit Read More »
1. For the lines drawn by Protel series and AD series software, no matter which layer (including wiring layer, Keepout layer, etc.) the lines are drawn on, double-click to open the properties of the line, and the keepout option must not be checked. Once the keepout option is selected, then This line cannot be generated …
CONTENTS 01 Conclusion 02 Summary 03 Simulation Condition 04 Clock Signal Analysis 05 Address/CMD Signal Analysis 06 DQ/DM/DQS Signal Analysis – Write 07 DQ/DM/DQS Signal Analysis – Read 08 Reference Conclusion This design could not run to 3732Mbps, which is limited by the branch length on ADDR/DQ nets. Lpddr4 uses different VREF and termination(ODT) strategies …
The routing direction of adjacent planes is orthogonal to the structureAvoid running different signal lines in the same direction on adjacent layers to reduce unnecessary crosstalk between layers; when it is difficult to avoid this situation due to board structure limitations (such as some backplanes), especially when the signal rate is high, It should be …
HDI is smaller and lighterThe HDI board is made of the traditional double-sided board as the core board through continuous lamination. This kind of circuit board made by continuous layering is also called build-up multilayer board (Build-up Multilayer, BUM). Compared with traditional circuit boards, HDI circuit boards have the advantages of “light, thin, short, and …
Electrical safety distance1. Spacing between wiresAs far as the processing capabilities of mainstream PCB manufacturers are concerned, the minimum distance between wires should not be less than 0.075mm. The minimum line spacing refers to the minimum distance from the board line to the line and from the line to the pad. From a production point …
The safety distance that must be considered in PCB design Read More »
1. Market sizeAs an important source of information interaction and perception in the era of the Internet of Things, smart sensors are an important pole of the future sensor market. From the perspective of the size of the smart sensor market, in terms of global statistics, according to statistics, the global smart sensor market is …
