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  • What are the points of attention in the PCB copper design?
    Date :2017-3-19

    Design and fabrication of the circuit board has a certain process and matters needing attention, the circuit board copper is a crucial step in PCB design, with certain technical content, so how to do the design work of this link? In the case of high frequency, capacitance wiring on printed circuit board will play a role, when the noise frequencies greater than the length of the corresponding wavelength 1/20, will produce the antenna effect and noise will be emitted outside through wiring, if there are bad grounding copper clad in PCB, copper became the noise spreading tool, therefore and in the high frequency circuit, do not think that, to a place to pick up the ground, this is the "ground", must take the distance is less than lambda /20, played on the wiring hole, ground plane and multilayer board "well grounded". If the treatment of copper is appropriate, the copper coating can not only increase the current, but also play a dual role of shielding interference.


    In the copper coating, in order to allow the copper to achieve our desired results, the need to pay attention to the problem of copper coated:
    1.If more PCB, SGND, AGND, GND, etc., will be based on the PCB plate in different position, with the main "place" as reference to independent copper, analog ground and digital ground to separate copper from the few words, while copper before the first bold power line the corresponding 5.0V, 3.3V and so on, as a result, on the formation of a number of different shapes of structure deformation.
    2.For different single point connections, the method is connected via 0 ohm resistors or magnetic beads or inductors.
    3.Crystal in the vicinity of the copper, the circuit of the crystal oscillator for a high frequency emission source, the practice is to surround the crystal covered with copper, and then the crystal shell of the grounding.
    4.Island (dead zone) problem, if you feel great, then it is not too much to define a hole into the hole to add.
    5.At the beginning of wiring, the ground should be treated equally, when the line should take the ground line, can not rely on the copper after the hole through the addition of the connection to eliminate the ground pin, so that the effect is not good.
    6.In the end it is best not to have sharp corner (《=180 degrees), because from the electromagnetism perspective, which is a transmitting antenna which has a influence on the other! There is only big or small, I recommend the use of arc along the edge.
    7.The middle layer of the multilayer wiring open area, do not cover copper. Because it's hard for you to make this copper cover a good grounding.
    8.Metal inside the equipment, such as metal radiator, metal reinforcement, etc., must achieve a good grounding.
    9.Three terminal regulator heat sink metal block, must be a good grounding. Crystal near the ground isolation belt, must be a good grounding. In short: the PCB on the copper, if the grounding problem is dealt with, it is certainly more advantages than disadvantages, it can reduce the return area of the signal line, reduce the external electromagnetic interference signal.



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