Efficient sharpening CIC filter embedding fifth‐order filter with coefficient optimisation algorithm
Lin Zhibin, Bo Gao, Yin Ruotong, Min Gong · Electronics Letters · 2020
This Letter presents an optimised cascaded integrator comb (CIC) filter sharpening algorithm embedding a fifth‐order finite impulse response filter, which improves the worst‐case alias rejection and simultaneously compensates the passband droop. The sharpening filter is designed without multipliers, which reduces hardware complexity. The results of a fourth‐order CIC filter design practice show that the proposed algorithm improves the worst‐case alias rejection to 128 dB, meanwhile the passband distortion is only 0.015 dB.