What problem need to pay attention to when the PCB copper clad

by:Rocket PCB     2020-07-27
The so-called copper clad is unused space on PCB as datum, then filled with a solid copper, the copper copper area is known as irrigation. Apply the meaning of the copper is, reduce the ground impedance, improve the anti-interference ability; Lower pressure drop, and improve the power efficiency; Connected to the ground, but also can reduce the loop area. We all know that under the condition of high frequency, wiring of distributed capacitance on the printed circuit board will work, when the length is more than 1/20 of the noise frequency corresponding wavelength, can produce the antenna effect, the noise will launch out through wiring, if in the PCB circuit board factory is bad grounding copper, copper clad became the tool of transmission noise, therefore, in the high frequency circuit, don't believe that somewhere in the ground after the, this is the 'ground', must be less than the spacing of lambda / 20, punch a hole in the cabling, and multilayer PCB ground plane 'well grounded'. If the copper clad processing properly, copper clad with increasing electric current, not only has played a dual role of shielding interference. In PCB copper clad copper clad copper in order to make our desired results, copper clad aspects need to pay attention to those problems: 1. If the PCB is more, there were SGND, AGND, GND, and so on, is depending on the position of PCB board face, respectively to the main 'to' independent copper clad as reference point, to digital and analog to separate copper from a few words, at the same time before the copper clad, first of all, bold corresponding power cords: 5. 0V、3. 3 v, etc. , as a result, it has formed the different shape of deformation structure. 2. To different single point of connection, it is through 0 the resistance or inductance connection or magnetic beads. 3. Metal inside the equipment, such as metal heat sink, metal reinforcing bar, etc. , must achieve 'well grounded'. 4. An island ( Dead zones) Problem, if you feel a lot, then define a pass hole added to also do not cost much. 5. Multilayer PCB layer empty expanse of wiring, not copper clad. Because it's hard to make the PCB copper clad 'well grounded'. 6. Copper clad near crystals, crystals is a high frequency emission sources in the circuit, it is around copper crystals, then crystal vibration of the shell shall be grounded. 7. , at the beginning of the wiring to earth alike, ground walk the line when it should go, can't rely on by adding a hole after the copper clad to eliminate for the connection to pin, the effect is very bad. 8. Had better not have sharp Angle on PCB board ( '= 180 degrees) Because in terms of electromagnetism, it is composed of a transmitting antenna! For the other there is always a is only big or small, I recommend using arc along the edge. 9. Three-terminal voltage regulator cooling metal, must be well grounded. Crystals near ground isolation belt, must be well grounded. In short: the copper on the PCB, if the grounding problem to deal with, affirmation is not do more harm than good, it can reduce signal backflow area, decrease the signal to external electromagnetic interference. In short: apply copper on the PCB, if the grounding problem to deal with, affirmation is not do more harm than good, it can reduce signal backflow area, reducing the signal to external electromagnetic interference.
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