Design of IIR filter based on FPGA

1.IIR Design of filter

about IIR There are many ways to implement filters , Including direct type 、 Cascade type and parallel type . Among them, the direct type is the most basic structure , Cascade type is an easy and efficient way .

Implementation of direct structure

2.  Design of direct filter

（1） Design principle

As mentioned earlier ,IIR The difference equation of the filter is ：

        

 

Because in hardware , Generally, multiplication and addition operations can only have two inputs , So you can get the network diagram as shown in the figure below .