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Printed circuit board (PCB), also known as printed circuit board, is the supplier of electrical connection of electronic components. Its development has a history of more than 100 years. Its design is mainly layout design. The main advantage of using circuit board is that it greatly reduces the wiring and assembly errors, and improves the automation level and production labor rate. According to the number of circuit board layers, it can be divided into single board, double board, four board, six board and other multilayer circuit boards.

High Density Interconnection (HDI) PCB is a kind of (technology) for the production of printed circuit boards. It is a circuit board with relatively high circuit distribution density using micro blind via and buried via technology.

With the rapid development of digital technology, electronic products are undergoing tremendous changes, especially in the mobile phone industry. As we all know, chips are the core components of smart phones, and the development of chip industry is related to the development of mobile phones and other electronic products.

Electronic components are components of electronic components and small machines and instruments. They are often composed of several parts and can be used in similar products; It often refers to some parts of electrical appliances, radios, meters and other industries, and is the general

The resistivity of semiconductors changes significantly with temperature. For example, pure germanium, for every 10 degrees increase in humidity, its electrical resistivity decreases to 1/2 of its original value.

A chip refers to a silicon chip containing integrated circuits, which is small in size and is a part of a mobile phone, computer, or other electronic device. If the most important organ of the human body is the brain, then chips are the "brain" of electronic devices. A chip is an integrated circuit, also known as a microelectronic chip, composed of many electronic devices, circuit components, organic matter, etc., packaged on a single silicon chip, and is one of the foundations of modern electronic technology. Because of its small size, low power consumption, high manufacturing difficulty, and high reliability