This paper presents a new multistage CIC-cosine decimation filter. The cascade of expanded cosine prefilters is added to improve the stopband CIC characteristic. The passband characteristic of this filter is improved by adding the simple 2M-order compensation filter, where M is the decimation factor. Using the multirate identity the compensation filter is moved to a lower rate. The resulting structure is multiplierless and exhibits high aliasing attenuation and a low passband droop. For the special case where the decimation factor is in the form 2k, where k is an integer, a speed and a low power structure is presented. The proposed method is compared with the selected existing methods.
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机译：本文提出了一种新型的多级CIC余弦抽取滤波器。添加了扩展余弦预滤波器的级联，以改善阻带CIC特性。通过添加简单的2M阶补偿滤波器（其中M是抽取因子），可以改善该滤波器的通带特性。使用多速率标识，将补偿滤波器移至较低速率。所得的结构是无倍数的，并表现出高的混叠衰减和低通带下垂。对于抽取因子为2 k 形式的特殊情况（其中k为整数），提出了一种速度和低功耗结构。将提出的方法与选定的现有方法进行比较。
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