source:Industry News release time:2022-03-30 Article author:sznbone Popular:pcb
1) Selection of materials. The selection of PCB materials must take into account aspects such as electrical and mechanical properties, relative price to purchase, and relative cost to manufacture.
Electrical properties refer to the insulation resistance, arc resistance, printed conductor resistance, breakdown strength, shear strength and hardness of the substrate.
2) Determination of thickness. The choice of thickness is mainly to consider the weight bearing capacity of all components mounted on the printed board and the mechanical load capacity in use.
The thickness of PCB has been standardized, its size is 1.0mm, 1.5mm, 2.0mm, 2.5mm, the most commonly used are 1.5mm and 2.0mm.
3) Shape and size. The shape of the PCB should be as simple as possible, generally rectangular, and the use of special-shaped boards should be avoided as much as possible. The size of the PCB should be as close as possible to the size of the standard series to simplify the process and reduce the processing cost.
PCB Ground Wire Design
1) Generally, the common ground wire is arranged on the edge of the PCB, and a certain distance is left, which is convenient for the installation and machining of the printed circuit board, and is conducive to improving the insulation performance of the circuit.
2) When designing high-frequency circuits, in order to reduce the lead inductance and grounding impedance and prevent self-excitation, the ground wire should have a sufficient width.
3) The ground wire of each circuit on the PCB can be designed as a self-closed loop in most cases. However, when there is a strong magnetic field outside, it should be avoided that the coil composed of the closed ground wire will generate electromagnetic induction and affect the electrical performance of the circuit.
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