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Why printed circuit board need impedance control?
Why printed circuit board need impedance control? In the transmission signal line of an electronic device, the resistance encountered when the high-frequency signal or electromagnetic wave propagates is called impedance. Why do PCB boards have to be impedance during the manufacturing process of the circuit board factory? Let us analyze from the following 4 reasons: 1. The PCB circuit board of the ...
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Why most multi-layer circuit boards are even-numbered layers?
There are single-sided, double-sided and multi-layer circuit boards. The number of multi-layer boards is not limited. There are currently more than 100-layer PCBs. The common multi-layer PCBs are four layer and six layer boards. Then why do people have the question "Why are PCB multilayer boards all even-numbered layers? Relatively speaking, even-numbered PCBs do have more than odd-numbered PCBs, ...
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Half-hole Design of Circuit Board
The metalized half-hole means that after drill hole (drill, gong groove), then the 2nd drilled and shaped, and finally half of the metalized hole (groove) is retained. In order to control the production of metal half-hole boards, circuit board manufacturers usually take some measures due to process problems at the intersection of metallized half-holes and non-metallized holes. Metallized half-hole...
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PCB SURFACE FINISHING, ADVANTAGES AND DISADVANTAGES
Anyone involved within the printed circuit board (PCB) industry understand that PCBs have copper finishes on their surface. If they are left unprotected then the copper will oxidize and deteriorate, making the circuit board unusable. The surface finish forms a critical interface between the component and the PCB. The finish has two essential functions, to protect the exposed copper circuitry and t...
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A&Q of PCB （2）
9. What is resolution? Answer: Within a distance of 1mm, the resolution of the lines or spacing lines that can be formed by the dry film resist can also be expressed by the absolute size of the lines or spacing. The difference between the dry film and the resist film thickness The thickness of the polyester film is related. The thicker the resist film layer, the lower the resolution. When the ligh...
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Ceramic PCB Board
Ceramic circuit boards are actually made of electronic ceramic materials and can be made into various shapes. Among them, the ceramic circuit board has the most outstanding characteristics of high temperature resistance and high electrical insulation. It has the advantages of low dielectric constant, low dielectric loss, high thermal conductivity, good chemical stability, and similar thermal expan...
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How to make a pcb in panel?
1. The outer frame (clamping side) of the Printed Circuit Board panel should adopt a closed-loop design to ensure that the PCB jigsaw will not be deformed after being fixed on the fixture; 2. PCB panel width ≤260mm (SIEMENS line) or ≤300mm (FUJI line); if automatic dispensing is required, PCB panel width×length ≤125 mm×180 mm; 3. The shape of the PCB jigsaw should be as close to the square as poss...
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How to prevent PCB board warping during the manufacturing process
SMT(Printed Circuit Board Assembly, PCBA) is also called surface mount technology. During the manufacturing process, the solder paste is heated and melted in a heating environment, so that the PCB pads are reliably combined with surface mount components through the solder paste alloy. We call this process reflow soldering. Most of the circuit boards are prone to board bending and warping when unde...
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HDI board-high density interconnect
HDI board, high density interconnect printed circuit board HDI boards are one of the fastest growing technologies in PCBs and now available in ABIS Circuits Ltd. HDI boards contain blind and/or buried vias, and usually contain microvias of 0.006 or smaller diameter. They have a higher circuit density than traditional circuit boards. There are 6 different types of HDI PCB boards, from surface to su...
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