IIR低通滤波器在谐波监测中的应用

以IIR数字滤波器的基本理论为依据，结合滤波器的传递函数分子、分母系数固定这一事实，通过选用高密度可编程逻辑器件确定了IIR数字滤波器的硬件实现方案，并按照层次化、模块化、参数化的设计思路，采用VHDL硬件描述语言和原理图两种设计技术进行了IIR滤波器的硬件设计；对设计的低通滤波器进行了系数量化并对其影响进行了分柝最后进行了实际滤波效果测试，验证了设计的正确性。

Application of IIR Low-pass Filters for Measuring Harmonics

According to the basic theory of (?)R filters,a scheme of hardware implementation is worked out by selecting HDPLD and combining with the fact that coefficients of numerator and denominator of transfer function are fixed.From the clew of implementing a stratified,modularized and parameterized design,the thesis describes the hardware implementation of the (?)R filter with VHDL and schematic diagram design method,The effects of quantification of coefficient of the designed (?)R low-pass filters are analyzed.The accomplished design of (?)R low-pass filter is tested in experimental circuit The experiment result indicates that the design is correct.