基于多相结构和部分锐化的CIC抽取滤波器

李冰; 郑瑾; 葛临东

doi:10.3724/SP.J.1146.2005.01126

基于多相结构和部分锐化的CIC抽取滤波器

doi: 10.3724/SP.J.1146.2005.01126

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出版历程
- 收稿日期: 2005-09-06
- 修回日期: 2006-01-03
- 刊出日期: 2007-04-19

CIC Decimation Filters Based on Polyphase Structure and Partially Sharpening Technique

摘要

摘要: 该文将传统的CIC(Cascaded Integrator Comb)滤波器传递函数分解为递归和非递归部分，可独立调整两者的级联因子；对递归部分进行尖锐化处理改善滤波器的通带衰落，利用电路的等价交换性将抽取因子提前使其工作在低采样率；对非递归部分进行多相分解，实现高速滤波。计算机仿真表明：与传统的CIC、锐化CIC滤波器相比，改进的CIC具有好的通阻带特性；并从通带衰落和混叠抑制的角度，分析了递归和非递归部分的级联因子的取值对整个改进的CIC滤波器特性的影响。
- 积分梳状滤波器;采样率转换;多相滤波
Abstract: In this paper an improved solution to the design of Cascaded-Integrator-Comb (CIC) filter is proposed, in which the overall transfer function is factorized to recursive and non-recursive parts. The cascade factors of two parts can be adjusted independently. The sharpening is applied to recursive part to correct the passband droop, and decimation factor is moved prior to the sharpening of recursive part by the use of equivalent transform to operate at a low rate. Polyphase decomposition is applied to non-recursive part to realize high-speed filtering. Computer simulation shows that the modified CIC filter has a frequency response comparable to that of sharpening CIC filters while design flexibility is increased. The effect of the cascade factor of recursive and non-recursive parts on the modified CIC frequency response is discussed in terms of passband droop and alias rejection.

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[1] Hogenauer E B. An economical class of digital filters for decimation and interpolation[J]. IEEE Trans. on Acoust. Speech Signal Process., 1981, ASSP-29(2): 155-162. [2] Kwentus A Y, Jiang Z, and Wilson A N. Application of filter sharpening to cascaded integrator-comb filters[J].IEEE Trans. on Signal Process.1997, 45(2):457-467 [3] Kaiser J F and Hamming R W. Sharpening the response of a symmetric nonrecursive filter by multiple use of the same filter[J]. IEEE Trans. on Acoust. Speech Signal Process., 1977, ASSP-25(5): 415-422. [4] Jovanovic Dolecek G and Mitra S K. Efficient sharpening of cic decimation filter[C][J].IEEE ICASSP03, Hong Kong.2003, vol.4:385-388 [5] Stephen G and Stewart R W. High-speed sharpening of decimating CIC filter[J].IEE Electronics Letters.2004, 40(21):1383-1384 [6] Yong Hong Gao, Li Hong Jia, and Hannu Tenhunen. A partial polyphase VLSI architecture for very high speed CIC decimation filters[C].Proc.12th Annual IEEE Int.ASIC/SOC Conf., Washington, 1999: 391-395. [7] Young Beom Jang and Se Jung Yang. Non-recursive cascaded integrator-comb decimation filters with multiple factors[C]. Proc.44th IEEE Midwest Sympo. on Circuits and Systems, Dayton, OH, 2001: 130-133. [8] Stephen G and Stewart R W. Sharpening of partially non-recursive CIC decimation filters[C]. Proc.38th Annual Asilomar Conference on Signals, Systems and Computers, Pacific Grove, California, 2004, vol.2: 2170-2173. [9] Vaidyanathan P P. Multirate digital filters, filter banks, polyphase networks, and applications: A tutorial[J].Proc. IEEE.1990, 78(1):56-93 [10] Yong Hong Gao, Li Hong Jia, and Hannu Tenhunen. A fifth-order comb decimation filter for multi-standard transceiver applications[C]. IEEE International Symposium on Circuits and Systems, Geneva, Switzerland, 2000, vol.3: 89-92.

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