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​An Integrated Circuit (IC) functions by integrating various electronic components onto a semiconductor material, typically silicon.

Germanium, silicon, selenium, gallium arsenide and many metal oxides, metal sulfides and other objects, whose conductivity is between conductor and insulator, are called semiconductors. Semiconductors have some special properties. For example, the thermistor (thermistor) for automatic control can be made by using the relationship between the resistivity and temperature of the semiconductor; Using its photosensitive characteristics, photosensitive elements for automatic control can be made, such as photocells, photocells and photoresistors

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

For traces with a certain width, three main factors will affect the impedance of PCB traces. First of all, the EMI (electromagnetic interference) of the near field of the PCB trace is proportional to the height of the trace from the reference plane. The lower the height, the smaller the radiation. Secondly, the crosstalk will change significantly with the height of the trace. If the height is reduced by half, the crosstalk will be reduced to nearly a quarter.

At present, there are two general FPC welding processes, one is tin press welding, and the other is manual drag welding

Before designing multi-layer PCB circuit board, the designer needs to first determine the circuit board structure according to the scale of the circuit, the size of the circuit board and the requirements of electromagnetic compatibility (EMC),