AB模块1794-OF4IXT

1794-OF4IXT从频率轴的角度来思考。半导体集成电路（LSI、IC）不能以其单体的形式单独工作，需要安装在印刷电路板（PCB）上组成电路后执行工作。在印刷电路板（PCB）上，包括LSI内部在内，存在很多与布线相关的寄生分量。简单的有寄生电阻R（布线电阻）、寄生电容C（杂散电容）、寄生电感L（直流电感）等。经常听到的比较有代表性的有ESR（Equivalent Series Resistance：等效串联电阻）和ESL（Equivalent Series Inductance：效串联电感）。而寄生分量中麻烦的是电容分量和电感分量。这是因为存在于LSI内部和整个印刷电路板（PCB）的寄生电容C和寄生电感L会引发谐振现象。LC串联谐振和并联谐振可以发生在从低频到高频的各种频率上。在这些谐振频率上，阻抗会变为零或无穷大，从而形成容易发生误动作的频率。这也是需要很强的电磁敏感性（电磁抗扰度）的原因之一。之所以说是“之一”，是因为还有很多其他原因，比如容易误动作的电路结构和电路板底片等。一般说来，相比电磁干扰（EMI）对策，针对电磁敏感性（EMS）的对策更难，原因是电磁敏感性（EMS）涉及到诸多因素，而要判明其中的哪一个因素是起主要作用的，就需要时间和技巧了。

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