基于UAF42通用滤波芯片的50Hz陷波器设计

Design of a 50Hz notch filter using the universal active filter chip UAF42

为了压制工业电源的干扰(如50Hz干扰),经常要在输入电路中采用陷波电路。由于传统的双T陷波电路对元件的精度和对称性要求比较高,在实际中很难调试。文中介绍的由通用滤波器芯片UAF42构成的50Hz陷波电路克服了这方面的缺点。实验结果表明:基于UAF42设计的50Hz陷波器的频率响应达到了设计要求,具有调试方便、对元件精度要求不高的优点。

To suppress the 50Hz interference,a notch filter is needed in pre-stage circuit. The conventional twin-T network requires high-precision components and strict symmetry, but it is difficult to tune. The 50Hz notch filter using the universal active filter chip （UAF42） eliminates above disadvantages. The experiment results show that the 50Hz notch filter using UAF42 meets the design requirements. The design has the advantages of easy tuning and lower component tolerance requirement.