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Necessary work before printed PCB circuit board design

August 25, 2022

     Friends, the necessary work before printed circuit board (PCB) design,
Which ones are there? Many people will ignore them, which will affect the subsequent design. Now I will talk about the following work that should be done before the design of the printed circuit board (PCB):

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1.Carefully check the schematic diagram: The design of any printed board is inseparable from the schematic diagram. The accuracy of the schematic diagram is the basis for the correctness of the printed board. Therefore, before the design of the printed board, the signal integrity of the schematic must be carefully and repeatedly checked to ensure the correct connection between the devices.

2.Device selection: The selection of components is a very important link for the design of printed boards. Devices with the same function and parameters may have different packaging methods. The packages are different, and the solder holes (pads) of the devices on the printed board are different. Therefore, before embarking on the printed board design, be sure to determine the packaging form of each component.

3.In terms of device selection, multi-layer boards must be positioned in the selection of surface mount components (SMD). SMD is widely used in various electronic products due to its advantages of miniaturization, high integration, high reliability and installation automation. . At the same time, in the selection of devices, not only should the characteristic parameters of the device meet the needs of the circuit, but also the supply of the device to avoid the problem of device shutdown; at the same time, it should be realized that many domestic devices, such as chip resistors, capacitors, connection The quality of the device, potentiometer, etc. has gradually reached the level of imported devices, and it has the advantages of sufficient supply, short delivery time and low price. Therefore, under the condition of circuit license, domestic devices should be considered as much as possible.