电子设备中的ESD保护设计

介绍了静电放电(ESD)的工作机理以及静电放电给电子元器件所带来的损伤。通过对比压敏电阻与瞬变电压抑制二极管(TVS管)的特点,给出了如何选择ESD保护器件的一些建议。在分析了TVS管的工作原理及关键参数基础上,对TVS管选型标准进行了简要介绍。针对使用TVS管的保护电路,以IEC61000-4-2最高严酷度级别4的环境对电路中的寄生参数进行了分析,提出了优化ESD保护器件性能及PCB保护电路设计时需要注意的事项。以MAX3490E为例指出了集成片上ESD系统芯片的优点。

The Inter-connectivity Design between High Speed Differential Signals

The principle of electrostatic discharge(ESD) and its damage to electronic components are introduced.Some suggestions on the selection of ESD protection devices are given by comparing the characteristics of varistor and transient voltage suppressor(TVS).The TVS selection criterion is briefly introduced based on an analysis of the principle and key parameters of TVS.Some issues to be paid attention to in optimizing ESD protection device performance and PCB protection circuit design are proposed after analyzing the parasitic parameters in the protection circuit with TVS under conditions of IEC61000-4-2 degree 4.The advantages of on-chip ESD protection circuit are pointed out in an example of MAX3490E.