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When designing a four layer PCB circuit board, how to design the stack? Theoretically, there can be three schemes

Semiconductor refers to a material whose conductivity can be controlled from insulator to conductor. No matter from the perspective of science and technology or economic development, the importance of semiconductors is very great. Most of today's electronic products, such as computers, mobile phones or digital recorders, are closely related to semiconductors. Common semiconductor materials include silicon, germanium, gallium arsenide, etc., and silicon is one of the most influential semiconductor materials in commercial applications.

1. Introduction to chips What is a chip? A chip is an integrated circuit that can be compared to the brain of an electronic device. The components on a chip can perform various tasks, such as processing information, storing data, performing calculations, and controlling operations. Why is it called a chip? "Core" represents the core and center, and "chip" represents a thin piece or fragment. A chip is a thin piece made of semiconductor materials, which, as the core part of the entire circuit system, integrates key circuit structures.

The advantages of heavy copper PCB make it the top priority for the development of high-power circuits. The heavy copper concentration can handle high power and high heat, which is why high-power circuits have been developed using this technology. Such circuits cannot be developed with low-copper concentration PCBs because they cannot withstand the huge thermal stresses caused by high currents and flowing currents.

Wiring is the most important process in the entire PCB design.

On April 24, Han's Laser released its 2016 annual report and a quarterly report for 2017. During the reporting period, it achieved operating income of 6.959 billion yuan, a year-on-year increase of 24.55%, and realized net profit of 754 million yuan. In 17Q1, profit increased by 31.50%, and the profit growth rate in the first half of the year is expected to be 60%-90%.