The removal of copper from the through-hole can be caused by chemical factors, such as etching, or mechanical causes, such as blow-holing, stress cracking, or deposition detachment.
PCB products in quality and quantity, continue to tilt to the high-tech field, enterprises in technology research and development investment will continue to increase.
According to Prismark statistics, mobile terminal PCB demand is mainly HDI and flexible board (HDI board accounts for about 50.68%), and has 26.36% packaging substrate demand.
All of these problems can cause the solder shield to detach from the circuit board and eventually lead to corrosion of the copper circuit.
With the development of large-scale integrated circuit and super-large scale integrated circuit, the multilayer printed board (PCB) will be used more and more.
The microstrip line consists of a fixed length of metal or wire and the whole or part of the ground plane located directly below it.
The insulating substrate may be polyimide, polyethylene terephthalate, arylamide fiber ester and polyvinyl chloride.
In the future, with the emergence of new demands for automotive electronics, data centers and artificial intelligence, PCB industry will usher in new growth points.
The UV laser precisely cuts the blind slots of the target layer separated from the multilayer circuit board. In this area, the target layer cannot form a connection with the material covered above it.
Each circuit layer in the multilayer circuit board is pressed together by the action of semi-cured sheet; Depending on the circuit design, some areas of the semi-cured sheet need to be cut and then pressed together.
Any other design tricks such as considerably reducing the length of the goldfinger, terminal matching, Daisy chain connections or branch connections are designed to ensure that the signal sees a consistent instantaneous impedance.
Even many electronic design engineers are confused. This material will provide a brief and intuitive introduction to characteristic impedance, hoping to help you understand the rather basic qualities of transmission lines.
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