Analysis of FPGA based recursive and non-recursive digital filters according to hardware cost and performance

Digital filters are classified into two types: Finite impulse response (FIR) and infinite impulse response (IIR) filters according to their impulse response types. FIR filters are called as non-recursive filters since the output signal is dependent only on the input signal; whereas, IIR filters are called as recursive filters since the output signal is dependent both on the input and output signals. Although for given specifications, usually both FIR and IIR filter designs can be used, different approaches and problems arise for implementation of these methods on hardware. In this work, the problems which occurred during FPGA implementation of FIR and IIR filters are examined and the comparison of the two design methods is done by analyzing the hardware cost and performance.