Pontos de design de placa de circuito impressoPostado em 21/11/2019
In the past ten years, China’s fabricação de PCB industry has developed rapidly, and its total output value and total output rank first in the world. Printed circuit boards have gradually evolved from single-panel to double-panel and multi-layer boards, and are constantly moving toward high density, high precision, and high reliability. At the same time, the volume is reduced, the cost is reduced, and the performance is improved, so that the PCB continues to maintain a strong vitality in the development of future electronic products.
At present, printed circuit boards widely used in electronic devices used by many people have more printed wires and fewer printed components. If components and some mechanical structural parts are connected to the printed board, assembly processes such as mounting, soldering and coating are required, and the printed circuit board is called a printed mounting board. Currently, small components, transistors, and integrated circuits that are widely used in electronic devices must be mounted on printed boards. Especially the application of surface mount components is more inseparable from the printed circuit board.
In the design process, the circuit layout should be adjusted, and the design components can be automatically installed through the layout tool. If the automatic layout can be manually adjusted, it will help to improve the quality of the circuit board design. Through this measure, design rule detection will rely on technical documentation to ensure that the design meets the requirements of the board manufacturer.
And the PCB should be moderate. When the size is too large, the printed lines are long and the impedance is increased. Not only does the anti-noise ability decrease, but the cost is also high. If it is too small, the heat dissipation is not good, and it is susceptible to interference from adjacent lines. In terms of device layout, the relevant components can be placed as close as possible, so that better noise resistance can be obtained. Clock generators, crystal oscillators, and CPU clock inputs are prone to noise and are close to each other. Devices that are prone to noise, small current circuits, high-current circuits, etc. should be as far away as possible from the logic circuit. If possible, it is important to make a separate circuit board.
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