服务器高频辐射发射问题分析
Analysis of High Frequency Radiated Emission for Server
摘要 服务器在3 GHz辐射发射超出标准EN 55022的限值。根据产品结构和工作特性,找出干扰源为SAS驱动芯片,并通过在机箱上增加簧片触点、在SAS芯片和散热片之间添加吸波材料等整改措施,解决了服务器高频辐射干扰问题。
关键词 服务器;高频;辐射发射;电磁兼容;噪声
Abstract Radiated emission result of server product was over the limits on the basis of
standard EN 55022 at 3 GHz. According to the mechanical and the working character of
the product,the source of interference on the SAS drive IC was disclosed.Through the
method of retrofitting the chassis by metal spring finger and installing noise absorbing
material between SAS IC and heat sink, high-frequency radiated emission issue of
server product was solved.
Keywords server; high frequency; radiated emission; electromagnetic compatibility;
noise
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