source:Optimization dedicated release time:2022-10-10 Article author:yu Popular:pcb
An important way to reduce EMI is to design the PCB ground plane. The first step is to make the ground area as large as possible within the total area of the PCB board, which reduces emissions, crosstalk and noise. Special care must be taken when connecting each component to a ground point or plane, otherwise, the neutralizing effect of a reliable ground plane cannot be fully utilized.
A particularly complex PCB design has several stable voltages. Ideally, each reference voltage has its own corresponding ground plane. However, having too many ground planes will increase the manufacturing cost of the PCB, making it prohibitively expensive. The compromise is to use ground planes in three to five different locations, each of which can contain multiple ground sections. This not only controls the manufacturing cost of the circuit board, but also reduces EMI and EMC.
A low impedance grounding system is important if you want to minimize EMC. In multilayer PCBs, it is better to have a solid ground plane than a copper thieving or scattered ground plane because it has low impedance, provides a current path, and is the best source of reverse signals .
The length of time the signal takes to return to the ground is also very important. The time for the signal to and from the source must be comparable, otherwise an antenna-like phenomenon occurs where the radiated energy becomes part of the EMI. Also, traces that carry current to/from the signal source should be as short as possible, if the source and return paths are not of equal length, there will be ground bounce, which will also generate EMI.
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