片式电磁干扰对策元件的特性及其应用（5）

描述片式电磁干扰对策元件的基本原理和特性，以及在各种情况下应该如何选择适当的片式电磁干扰对策元件。     

片式电磁干扰对策元件的特性及其应用（3）

描述片式电磁干扰对策元件的基本原理和特性，以及在各种情况下应该如何选择适当的片式电磁干扰对策元件。     

片式电磁干扰对策元件的特性及其应用（2）

描述片式电磁干扰对策元件的基本原理和特性，以及在各种情况下应该如何选择适当的片式电磁干扰对策元件。     

片式电磁干扰对策元件的特性及其应用（1）

描述片式电磁干扰对策元件的基本原理和特性，以及在各种情况下应该如何选择适当的EMI对策元件。     

电动工具的电磁干扰抑制

文章分析了电动工具类产品产生电磁干扰的机理,介绍了电动工具电磁干扰抑制的方法,并给出了典型的电磁干扰抑制实例.     

Characteristics and Some Applications of Stripline Components

Basic characteristics of Stripline in various frequency bands from 1000 to 16,000 mc are summarized. Various components such as transitions to coaxial line, attenuators, hybrid rings, directional couplers, and filters are shown. Some applications of these components in practical high performance microwave circuits and equipment in the frequency range of 2500-10,000 mc are also described.     

A Method for Measuring the Characteristics of an EMI Suppression Ferrite Core

Almost all digital equipment has electromagnetic interference (EMI) suppression ferrite cores to encircle cables, such as mains and peripheral cables. However, their EMI suppression capability is hardly evaluated from the impedance characteristics provided by the manufacturers. Hence, this paper proposes to characterize the ferrite cores in terms of the insertion loss and the reflection coefficient. Theoretical and experimental investigations are carried out to develop a measurement jig for these parameters in the frequency range from 30 to 1000 MHz. It consists of a cylindrical metal rod placed above a metal ground plane, yielding a characteristic impedance of 270 Omega. In addition, a simple method is proposed for measuring the insertion loss and the reflection coefficient of a ferrite core under test. It is found that the proposed method can provide insertion loss data with an error of less than plusmn1.2 dB by using commercially available matching networks (baluns). The reflection coefficient of a ferrite core can be measured with an error less than plusmn1.0 dB. The matching characteristics of the adapters are critical factors that deteriorate measurement accuracy     

永磁直流电机的EMI抑制

永磁直流电机在小家电和电动玩具中应用非常广泛,电机在工作时会产生电磁干扰,对周围的电子设备和人员产生一定的危害.阐述了永磁直流电机的结构、工作原理和产生电磁干扰的原因.通过对电机电磁干扰(端子骚扰电压、骚扰功率、辐射骚扰)的测试,分析电机存在的电磁干扰并给出解决措施;分析解决措施的有效性,从而得出抑制永磁直流电机电磁干扰的最佳方案.     

PCI总线接口芯片S5920及其应用

S5920是AMCC公司推出的一种PCI总线接口芯片，文章介绍了S5920的结构和特性，详细描述了其信箱和直通通道的工作机制以及外加总线信号的定义，给出了利用S5920直通通道实现并行数据接口扩展卡的设计实例。     

传导性电磁干扰噪声的诊断与抑制方法

传导性EMI的测试主要是通过线性阻抗稳定网络(LISN)进行的,但测得的结果是共模(CM)噪声和差模(DM)噪声的混合信号,而滤波器的设计分为共模和差模两个部分.介绍传导性电磁干扰噪声的分离技术及EMI滤波器的阻抗匹配问题.通过实例证明,传导性电磁干扰噪声分离网络能对共模和差模噪声进行有效地诊断,为正确选用抑制噪声的EMI滤波器提供依据.