Ordinary PCB is usually made of copper foil and substrate bonding, and the main material of ceramic substrate is alumina, beryllium oxide, aluminum nitride and other metal oxide ceramics, the performance of the two is quite different.
the process requirements of PCB circuit boards in each industry have gradually improved. For example, gold and copper are used in the circuit boards of mobile phones and computers.
In this paper, the design of PCB Roche coil and integral circuit board will be introduced in detail, the frequency characteristics of the system will be analyzed by PSpice simulation software, and the existing experimental conditions will be used to build
Halogens are halogens in the periodic table, including fluorine, chlorine, bromine and iodine. Halogen-free board is to replace or replace these harmful elements to achieve environmental protection and non-toxic PCB.
The following processes of PCB circuit board production need pure water cleaning: copper plating, gold plating, silver plating, nickel plating, tin plating. Can be used for multilayer circuit board, double layer circuit board and single layer circuit boar
The presets need to contain both electrical and structural reliability. Generally in the preset very high speed PCB wrench (greater than GHz frequency) this board problem will be relatively tight.
At present, the global PCB enterprises are mainly distributed in China, Japan, South Korea and other places. The downstream application field of PCB industry is very wide, which is less affected by a single industry, so it is relatively dispersed, with ma
PCB surface needs to be welded components, so a part of the copper layer needs to be exposed for welding. These exposed layers of copper are called pads. The pad is generally rectangular or circular, and the area is small.
which makes the direction of high frequency, high power and miniaturization. High signal power, high current and high voltage put forward higher requirements for PCB surface copper degree and hole copper thickness.
PCBA welding processing, usually PCB board has a lot of requirements, and must meet the requirements of the board to accept welding processing.
the polymer resin containing phosphorus nitrogen compounds will produce non-combustible gas when it is burned. This gas can isolate the surface and air of the resin combustion
In a circuit with resistance, inductance, and capacitance, an obstacle to alternating current is called an impedance. Impedance is usually denoted by Z, which is a complex number.