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Why does the PCB board of the circuit board factory have to be impedance?
2021-09-04
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Author:Belle

In the transmission signal line of electronic devices, 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 circuit board factory should consider plugging and installing electronic components. The later SMT patch connection also needs to consider issues such as conductivity and signal transmission performance, so the lower the impedance, the better. ??

2. The PCB circuit board undergoes copper sinking, electrolytic tin plating (or chemical plating, thermal spray tin), and connector soldering during the production process. The materials used must require low resistivity to ensure the overall impedance value of the circuit board The normal operation can only be achieved when the product quality requirements are met.

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3. The tin plating of pcb circuit board is the most prone to problems in the whole circuit board production, and it is the key link that affects impedance; its biggest defect is easy oxidation or deliquescence, poor solderability, which makes the circuit board difficult to solder and excessive impedance. High, resulting in poor electrical conductivity or instability of the overall board performance. ??

4. The conductors in the pcb circuit boards of the circuit board factory will transmit various signals. The circuit itself will change the impedance value due to the etching, stack thickness, wire width and other factors, which will cause the signal to be distorted and lead to the circuit board. The performance drops, so it is necessary to control the impedance value within a certain range.


iPcb Circuit Co., Ltd. (iPcb®) mainly focuses on Microwave High Frequency PCB, High Frequency Mixed Voltage, Ultra-high Multilayer IC Test, from 1+~ to 6+ HDI, Anylayer HDI, IC Substrate, IC test Board, Rigid-Flexible PCB, and ordinary Multilayer FR4 PCBs and etc. Products are widely used in Industry 4.0, Communication, Industrial Control, Digital, Oower supply, Computer, Automobile, Medical, Aerospace, Instruments, Meters, Internet of Things and other fields. Customers are distributed in China and Taiwan, South Korea, Japan, the United States, Brazil, India, Russia, Southeast Asia, Europe and other parts of the world.


iPcb Circuit Co., Ltd. (iPcb®) has passed ISO9001, UL, RoHS and other Quality Management System Certifications. Factory production line imported precision of circuit board production and testing equipment, senior PCB production Technoloty Team, has more than 10 years of production experience and high Quality Management Team, to form a perfect guarantee system and strict quality management. In strict accordance with the IPC standard production.Acceptance standards to ensure that the products are in line with customer quality requirements and IPC standards. The company advocates the quality concept of “Do it best & Prevent it First”, improves PCB production efficiency, save the cost and working time so that provide the best business timing to all customer.