Common format of Gerber file used in PCB manufacturing: Rs-274-x (common) Rs-274-d (common) RS-274 Fire 9000 Mda 9000 Barco DPF The standard Gerber file format can be divided into rs-274 and rs-274x Gerber file and aperture in rs-274 format are separate and different files. The aperture of rs-274x format is integrated into Gerber file, so…
ENIG PCB and flash gold PCB are commonly used in PCB design and PCB production. With the increasing integration of IC, IC pins are more and more dense. However, it is difficult for HASL process to blow even the fine pad, which brings difficulty to SMT assembly; in addition, HASL PCB has a short service…
1. The PCB layout design should fully comply with the design principle of placing along the signal flow direction in a straight line and avoid looping as far as possible. 2. Each filter capacitor should be placed as close as possible to the power supply pin of the chip 3. Whether the printed circuit board…
The so-called "no rules, no square circle", PCB design is the same. When engineers carry out PCB layout, some "rules" must be followed by everyone. 1. Understand the manufacturer's manufacturing specifications – trace width, trace spacing, via hole requirements and layer requirements. 2. Limit values of vias, trace width and safe spacing should…
PCI Express (peripheral component interconnect express) is a high-speed serial computer extension bus standard. Its original name is “3gio”. It was proposed by Intel in 2001 to replace the old PCI, PCI-X and AGP bus standards. PCIe is a high-speed serial point-to-point dual channel high bandwidth transmission. The connected device allocates exclusive channel bandwidth and…
1. Why do EMC design for products? Answer: meet the functional requirements of the product, reduce the debugging time, make the product meet the requirements of EMC standards, so that the product will not produce electromagnetic interference to other equipment in the system. 2. How many aspects can EMC design be carried out? Answer: Circuit…
All kinds of electronic devices are assembled on the circuit board by surface packaging process. Which is to assemble the assembled PCB with the shell to form a finished product. That is to say, PCB blank board passes through SMT and then goes through the whole process of dip plug-in, referred to as PCB’A. PCBA…
Aluminum printed circuit board has excellent electrical performance, heat dissipation, electromagnetic shielding, high dielectric strength and bending resistance. It is widely used in many industries, such as high-power LED lighting, power supply, TV backlight, automobile, computer, air conditioning frequency conversion module, avionics, telecommunications, health care, audio, etc. Even the most commonly used mobile phone camera,…
When the temperature rises to a certain area, the substrate will change from "glass state" to "rubber state", and the temperature at this time is called the glass transition temperature (TG) of the PCBs. In other words, TG is the maximum temperature (??) at which the substrate remains rigid. At high temperature, ordinary PCB substrate…
1. What is halogen free substrate According to jpca-es-01-2003 standard: the copper clad laminate with chlorine (Cl) and bromine (Br) content less than 0.09% wt (weight ratio) is defined as halogen-free copper clad laminate. (at the same time, total CI + br ≤ 0.15% [1500ppm]). 2. Why should halogen be banned Halogen refers to…
With the increasing complexity of electronic components and switches, faster signal flow is needed to improve the transmission frequency. Due to the short rise time of the electronic component pulse, it is necessary to regard the conductor width as the electronic component in high frequency technology. According to the different parameters, the high frequency signal…
With the service of 5g, the 5th generation mobile communication system, is expected to be provided in the future. In this trend, the multi-layer substrate materials, which play a central role in the servers and routers supporting the communication network backbone system, should be halogen-free PCB materials in addition to high-capacity and high-speed transmission. With…
The birth and development of FPC and PCB gave birth to the new product of rigid flex PCB. Therefore, the rigid flexible PCB is a circuit board with FPC characteristics and PCB characteristics formed by combining flexible FPC and rigid pcb together according to relevant process requirements through pressing and other processes. Because rigid flexible…
Answer: the quality of transmission lines for high-speed transmission and high-frequency signal transmission is much stricter than that of transmission wires. It is no longer "open / short circuit" test pass, or notch, burr does not exceed 20% of the line width. It must be required to measure the characteristic impedance value, and the impedance…
Antenna module is an indispensable module in almost all communication electronic equipment. A good antenna design scheme can not only make the equipment run more stable, but also is one of the important embodiment of equipment quality.Although the antenna design seems to be a small part, it is not easy to ensure the stability of…
Before introducing VIPPO, I want to divide the production process of vias into two parts: the first half is called “drilling”, and the second half is called “plug hole”. These holes include through holes, blind holes, buried holes, back drills, etc.; plug holes are the process of copper-plated plug holes, including full plugs, half plugs,…
