Design & Analysis of IIR notch filter using Bandwidth Parameter

Abstract: The purpose of IIR notch filter is to remove Narrow Band Interference signal while leaving Broad Band Signal unchanged in communication system. This research paper presents a method for design of fixed notch filter at center frequency FO (90MHZ). We calculate two parametric values like pass band ripple &stop band attenuation by using mathematical modeling. For this purpose we have selected elliptic design method, direct form II transposed SOS algorithm. Bandwidth ranging from 0.2GHz to 200 MHz has been generated with the help of different RF & AF oscillator. Filter approximation and order of the notch filter determine overall performance improvement in presence of Narrow Band Interference. The settling time of the filter should be as low as possible. From the realization perspective, the filter consumes more power and becomes more complex with increasing filter’s order. As a result, minimum settling time, complexity and power consumption have been achieved, with the use of second order filter. The performance and realization of IIR notch filter has been presented in this paper. It is easy to implement in communication at transmitter or receiver, as it has good communication system response. This notch filter can be realized by a computationally efficient lattice structure. Keyword: RF&AF-Radio&audio Frequency, NBI-Narrowband Interference, BBS-Broadband Signal, APASS=Passband Ripples ASTOP=Stopband Attenuation, BW-bandwidth.