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Separated Wideband CIC Compensator with High-Flatness and Low-Complexity Implementation

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Abstract

This paper proposes an efficient compensator of the cascaded integrator comb filter (CIC filter) to improve the passband droop. A compensator is separated into two stages and separately inserted into the CIC filter. The amplitude-frequency response of the proposed method is compared with other proposals in recent literature, and the comparison shows that the proposed method obtains flatter passband (less than 0.013 dB in the wideband case and less than 0.0003 dB in the narrowband case). The multiplierless implementation of the proposed method only introduces 15 adders and 7 registers, which ensures the low-complexity hardware structure.

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  1. Zhibin Lin and Min Gong have contributed equally to this work.

Authors and Affiliations

  1. College of Physics, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu, 610065, Sichuan, China

    Zhibin Lin & Min Gong

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  1. Zhibin Lin
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  2. Min Gong
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Correspondence to Zhibin Lin.

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Appendix A Coefficients for \(M \ge 32\)

Appendix A Coefficients for \(M \ge 32\)

The passband droop increases, while the decimation ratio is increasing from 16 to 32. Therefore, the coefficients demonstrated in Table 9 can be adopted for the decimation ratio greater than or equal to 32.

Table 9 Coefficients for wideband, \(M \ge 32\)
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Lin, Z., Gong, M. Separated Wideband CIC Compensator with High-Flatness and Low-Complexity Implementation. Circuits Syst Signal Process 43, 1889–1904 (2024). https://doi.org/10.1007/s00034-023-02547-4

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