D-SUB 接口的EMI问题分析及对策
EMI Problem and Its Solution for Laptop's D-SUB Port
摘要 介绍某款笔记本电脑由于D-SUB接口信号处理不当造成的系统辐射超标问题,并分别使用改善接口接地和信号滤波的方法对辐射进行抑制。结果表明:加滤波元件的方法可使产品符合GB 9254—2008 B级ITE的限值要求。最后,综合信号传输性能选择了最符合要求的整改方案。
关键词 D-SUB接口;笔记本;辐射骚扰
Abstract The electromagnetic inference (EMI) problem of laptop’s D-SUB port is mainly
discussed, including analyzing and debugging. Two methods are utilized to suppress
EMI emission, which are improving the interface grounding and adding signal filters in
D-SUB. The latter method could help the product to be compliant with the limits of GB
9254 Class-B. Finally, the best solution for better signal integration and minimum
radiation is put forward.
Keywords D-SUB interface;laptop;radiated disturbance
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