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.

中文翻译：

---

高效锐化CIC滤波器嵌入五阶滤波器系数优化算法

本文介绍了一种优化的级联积分器梳状 (CIC) 滤波器锐化算法，该算法嵌入了一个五阶有限脉冲响应滤波器，可改善最坏情况的混叠抑制并同时补偿通带下垂。锐化滤波器的设计没有乘法器，这降低了硬件复杂性。四阶CIC滤波器设计实践结果表明，该算法将最坏情况混叠抑制提高到128 dB，同时通带失真仅为0.015 dB。