The isolator is used to eliminate high common-mode disturbance produced by the laser power, and the design principle for embedded hardware and the function for software are presented.

介绍了利用隔离器抑制激光电源产生的强共模干扰对系统影响方法和系统嵌入式硬件设计的原理和系统软件功能。

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The problem in the communication between DSP and PC based on RS-485 is presented, and the solution of common-mode disturbance and EMI which are generated by incorrect ground connection is stated.

DSP与PC机的通讯以RS-485为基础，分析了RS-485总线在组网过程中因地线的不正确连接引发的共模干扰和EMI问题，并提出了解决方法。

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But most attention should be put on the PCB design, elements position and line connection, which can suppress the source of the common mode disturbance.

但最根本的应该是在印刷电路板设计、元器件布置和连接线的安排上下功夫，抑制共模骚扰源的产生。

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