DESIGN AND IMPLEMENTATION OF DIGITAL FILTER USING CIC AND FIR FILTER

Shweta Madiwalar, Namita Tarale, Rucha Patil

Abstract: This paper focuses on design and implementation of CIC-FIR (cascaded integrator-comb-finite impulse response) filter structure for receivers. In Digital Signal Processing, BPFs are essential element of everyday electronics were signals are to be restricted for particular high pass and low pass cutoff frequencies. BPFs(band pass filters) can be designed using FIR filters but due to the increase in complexity of hardware and challenge in meeting timing closure of the design ,CIC-FIR filter structure has been proposed to overcome these disadvantages of FIR filter based BPF design. Hence several comparisons made using CIC-FIR Structure for different order and sampling frequency to prove that CIC-FIR structure is better to design BPF. This structure will reduce the sampling rate of the filter making system requirements feasible to implement. This design helps to reduce power consumption indirectly and also timing closure could be met easily.

Keywords: CIC Filters, FIR Filters, FIR-CIC filter, Decimator, Interpolators, Matlab.

DOI: https://doi.org/10.15623/ijret.2017.0601015