Product ESD protection design is a system-level project, which cannot be achieved merely from the perspective of circuit ESD protection design. PCB design is a crucial part of solving ESD protection problems. The main design ideas for PCB ESD protection are as follows: sensitive signals or circuits should be kept away from electrostatic discharge test points; minimize the signal loop area to reduce noise coupling; reduce the potential difference of the reference ground plane to maintain the stab
Product ESD protection design is a system-level project, which cannot be achieved merely from the perspective of circuit ESD protection design. PCB design is a crucial part of solving ESD protection problems. The main design ideas for PCB ESD protection are as follows: sensitive signals or circuits should be kept away from electrostatic discharge test points; minimize the signal loop area to reduce noise coupling; reduce the potential difference of the reference ground plane to maintain the stability of the signal reference level.
PCB Stack-Up Design Optimization for ESD Performance
Analysis of the Mechanism of PCB Stack-Up Design on ESD Performance
A well-designed PCB stack-up can provide a complete return path for high-speed signals, reduce the signal loop area, and lower the susceptibility of signal coupling to electrostatic discharge noise interference. It can also reduce the parasitic inductance of the reference ground plane and minimize the ground potential difference generated when high-frequency current flows through the ground plane during electrostatic discharge. In addition, a proper PCB stack-up enables the formation of a good planar distributed capacitance between the reference ground plane and the power plane, ensuring a stable power supply for the system.
Recommended Stack-Up Design for Four-Layer PCBs
Explanation of Four-Layer PCB Stack-Up Design
For four-layer PCBs, signal lines are usually arranged on the top and bottom layers, while a complete reference ground plane is maintained on the 2nd or 3rd layer. The power plane is divided according to the number of power supply types, and the integrity of the corresponding signal reference is maintained based on the routing of the signal layer adjacent to the power plane, so as to reduce the impacts such as cross-partitioning. If there are more signal routings on the top layer, it is preferable to keep the integrity of the reference on the 2nd layer; if there are more signal routings on the bottom layer, the integrity of the reference on the 3rd layer should be prioritized.
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