在许多便携式设备中，其开关电源的噪声和电磁干扰(emi)是亟待解决的问题，比较好的办法是利用扩频技术来减少EMI信号的功率成分。
In many portable instruments, the noise and EMI of its switch power supply must be solved, the preferable method is that EMI power is reduced with spread spectrum frequency technique.
介绍开关电源的常态噪声和共态噪声产生的原因，以及几种抑制噪声的方法。
It presents the causes of the normal-model noise and common-model noise of the switching mode power supply and methods to restrict the noises.
开关电源产生的噪声比常规线性电源产生的噪声大得多。
The noise in the switching power supply is much larger than the noise in the conventional linear power supply.
本文侧重研究了典型开关电源中的几种EMI形式，即传导干扰(包括差模和共模噪声)和辐射干扰。
This dissertation examines the different kinds of EMI in typical SMPS, namely conducted (differential and common mode) and radiated interferences.
大功率通信高频开关电源的噪声干扰中除了有谐波的传导干扰外，还存在电磁的辐射干扰问题。
In high-frequency switching power supply, influence on switching power supply by the more parasitic transformer parameters is increasing.
大功率通信高频开关电源的噪声干扰中除了有谐波的传导干扰外，还存在电磁的辐射干扰问题。
In high-frequency switching power supply, influence on switching power supply by the more parasitic transformer parameters is increasing.
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