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PCB layout design should follow the principle

Shenzhen Inno Circuit Co.,Ltd | Updated: Jun 20, 2018

PCB layout design should follow the principle

A PCB circuit board is a support for circuit components and devices in electronic products. Even if the schematic design is correct, improperly designed printed circuit boards can adversely affect the reliability of electronic products. When designing a printed circuit board, attention should be paid to adopting the correct method and complying with the general principles of PCB design, and should comply with the requirements of anti-jamming design.

    First, the PCB layout design should follow the principle:

    First, consider the PCB size. When the PCB size is too large, the printed lines are long, the impedance is increased, the anti-noise ability is reduced, and the cost is also increased. When the size is too small, the heat is not good, and the adjacent lines are susceptible to interference. After the size of the printed circuit board is determined, the position of the special component is determined. Finally, according to the functional units of the circuit, all the components of the circuit are laid out.

    Observe the following principles when determining the location of a particular component:

    1, as short as possible to shorten the connection between high-frequency components, trying to reduce their distribution parameters and mutual electromagnetic interference. Components that are susceptible to interference cannot be placed too close to each other, and input and output components should be as far apart as possible.

    2. There may be a high potential difference between some components or wires, and the distance between them should be increased to avoid accidental short circuit caused by discharge. Components with high voltage should be placed as close to the hand as possible during commissioning.

    3, components weighing more than 15g, should be fixed with a bracket, and then welded. Those components that are large, heavy, and have a lot of heat should not be mounted on the printed board, but should be mounted on the chassis of the chassis, and heat dissipation should be considered. The thermal element should be away from the heating element.

    4. The layout of adjustable components such as potentiometers, adjustable inductors, variable capacitors, and micro switches should consider the structural requirements of the complete machine. If the adjustment is in-camera, it should be placed on a convenient place on the printed circuit board; if it is externally adjusted, its position should be in accordance with the position of the adjustment knob on the chassis panel.

    5. The position occupied by the PCB's positioning holes and fixing brackets should be left.

    Second, the PCB layout of the components of the circuit must meet the requirements of anti-jamming design:

    1. Arrange the positions of each functional circuit unit according to the circuit's flow, so that the layout is convenient for signal circulation and the signal is kept in the same direction as possible.

    2. Focus on the core components of each functional circuit and lay out around it. Components should be uniformly, neatly, and compactly arranged on the PCB. Minimize and shorten leads and connections between components.

    3, in the work of high-frequency circuits, to consider the distribution parameters between components. General circuits should arrange parallel components as much as possible. In this way, it is not only beautiful, but also easy to install and easy to mass produce.

    4. The components located on the edge of the circuit board are generally not less than 2mm from the edge of the circuit board. The best shape of the circuit board is a rectangle. The length and width are 3:2 or 4:3. When the circuit board surface size is greater than 200 x 150 mm, the mechanical strength of the circuit board should be considered.

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