描述
IC755CSS12CDB-BG
在电路系统设计中应遵循“一点接地”的原则,如果形成多点接地,会出现闭合的接地环路,当磁力线穿过该回路时将产生磁感应噪声,实际上很难实现“一点接地”。因此,为降低接地阻抗,消除分布电容的影响而采取平面式或多点接地,利用一个导电平面(底板或多层印制板电路的导电平面层等)作为参考地,需要接地的各部分就近接到该参考地上。为进一步减小接地回路的压降,可用旁路电容减少返回电流的幅值。在低频和高频共存的电路系统中,应分别将低频电路、高频电路、功率电路的地线单独连接后,再连接到公共参考点上。
滤波是抑制传导干扰的一种很好的办法。例如,在电源输入端接上滤波器,可以抑制开关电源产生并向电网反馈的干扰,也可以抑制来自电网的噪声对电源本身的侵害。在滤波电路中,还采用很多专用的滤波元件,如穿心电容器、三端电容器、铁氧体磁环,它们能够改善电路的滤波特性。恰当地设计或选择滤波器,并正确地安装和使用滤波器,是抗干扰技术的重要组成部分。
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