The layout design of the PCBA circuit board is exquisite
The density of PCBA printed circuit boards is getting higher and higher, and the quality of PCBA design has a great impact on the ability to resist interference, so the layout of PCBA is in a very important position in the design.
Layout requirements for special components:
1. The shorter the connection between high-frequency components, the better, to minimize electromagnetic interference between each other; Components that are susceptible to interference should not be too close to each other; The input and output components should be kept as far away as possible;
2. Some components have a high potential difference, so the distance between them should be increased to reduce the common mode radiation. Special attention should be paid to the rationality of the layout of components with high voltage;
3. The heat-sensitive element should be kept away from the heat-generating element;
4. The capacitor should be close to the power pin of the chip;
5. The layout of adjustable components such as potentiometers, adjustable inductance coils, variable capacitors, and micro switches should be placed in a position that is easy to adjust as required;
6. The position occupied by the positioning hole and the fixing bracket of the printed board should be set aside.
Layout requirements for common components:
1. Place the devices of each functional circuit unit according to the flow of the circuit to make the signal flow direction as consistent as possible;
2. Take the core components of each functional circuit as the center, and lay out around it, and the components should be evenly and neatly arranged on the PCBA to minimize and shorten the leads and connections between the components;
3. For circuits working at high frequencies, the interference between components should be considered, and the general circuit should make the components arranged in parallel as much as possible to facilitate wiring;
4. The outplace of the PCBA is generally not less than 80mil from the edge of the circuit board. The optimal shape of a circuit board is a rectangle.