PCB layout
date：2018-11-16 16:51:00
PCB layout
After the component layout is determined, the wiring can be started. The following points should be noted when wiring the printed circuit board:
1) The wiring should be short, especially the base of the transistor, the high-frequency lead, the lead with high and low potential difference, and the adjacent lead should be as short as possible, the spacing should be as large as possible, the turn should be round, and the wire for input and output should be used. Try to avoid adjacent parallelism.
2) The common common ground line is arranged at the edge to facilitate the placement of the printed circuit board on the casing.
3) Printed conductors on the same layer of printed circuit board that should not be connected cannot cross. The minimum width of the printed conductor is mainly determined by the adhesion strength between the conductor and the insulating base and the current flowing through them. A wire width of 1.5 mm is sufficient. For integrated circuits, especially digital circuits, a wire width of 0.02 to 0.3 mm is usually selected.
4) The curved corner of the printed conductor generally takes a circular arc shape, and the right angle or angle affects the electrical performance in the high frequency circuit. In addition, try to avoid the use of large-area copper foil, otherwise, when heated for a long time, copper foil expansion and falling off are prone to occur. When large-area copper foil must be used, it is best to use a grid shape. This is advantageous in eliminating volatile gases generated by the heat of the adhesive between the copper foil and the substrate.
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