improve EMI impact on design products
date：2018-11-07 11:12:00
Use EMI countermeasures to improve EMI impact on design products
However, with the metal shield design, it must be matched with the grounding wiring of the PCB printed circuit board. The fixed solder joints for the metal shield can be reserved around the high-frequency components. In addition to the direct shielding effect, the solder joint must also achieve the shield grounding design. The high frequency electromagnetic interference problem is effectively suppressed. After solving the biggest EMI problem interference source, the interference problem of the PCB itself can be improved, and the EMI problem can be improved with the countermeasure electromagnetic interference improvement component to improve the design.
For example, for the clock circuit required for the CPU line, a filter circuit for preventing electromagnetic interference can be added, and a common mode choke coil can be additionally set according to the GPU high-frequency I/O of the high-frequency data transmission operation state (Common mode Choke Coil) As for the key ICs, bypass capacitors (Bypass Condenser) or Ferrite Beads (FB) components can be selected on their power lines.
The common mode choke coil component is usually quite common on the motherboard or interface card. The common mode choke coil is mainly used for filtering and improving the EMI problem, especially for the electromagnetic radiation that can be generated by the high-speed signal line. It is especially good. It can also be used to eliminate the input interference signal of the signal line or the interference of various ambient noise/noise noise. Common mode choke coils, also known as common mode inductors, common mode coils, are quite common in switching power supply designs, and there are currently chip components for small circuit designs.
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