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This paper presents a technique for minimization of ripples of interpolated finite impulse response (IFIR) filter. Single-stage and two-stage IFIR filters are designed using the Remez exchange algorithm. The performance of these filters is improved by minimizing the ripples in the stopband region by discarding zero-valued coefficients. The proposed technique yields the desired filter response of IFIR filters matching closely with the required response of finite impulse response (FIR) filter in the passband and stopband regions, providing very low computational complexity and sharp transition width as compared to the conventional FIR filter. In comparison to other existing techniques, the proposed algorithm reduces the stopband ripples significantly (the distortion in the frequency domain is reduced up to 61.20%). As a result, the power losses in the filtered signal are reduced, thereby enhancing the sensitivity and its consistency during the filtering process.

Coefficient Reduction Method for Stopband Ripple Minimization of IFIR Filter