GE控制器IC693MDL646LT

GE控制器IC693MDL646LT由于电力线工作环境复杂， AFE031接收到的信号可能含有各种干扰，因此，有必要为Rx路径设置一个外围的带通滤波器F1，F1是四阶带通滤波器，其设计可遵循以下原则：首先选定滤波器特征阻抗Zc，该值与传输线阻抗匹配，对于PLC应用，可设定为1kΩ；然后确定电阻大小，两电阻R1、R2起到分压作用，当选择R1=R2=Zc，信号有-6dB的衰减，若选择R1=Zc，R2=10Zc，则信号有接近0dB的增益

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