Maximally Flat CIC Compensation Filter: Design and Multiplierless Implementation

Fernández-Vázquez, Alfonso; Dolecek, Gordana Jovanovic

doi:10.1109/tcsii.2011.2180093

Cited by 53 publications

(34 citation statements)

References 12 publications

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“…Since the error function is an even function of ω, its odd indexed derivatives evaluated at ω = 0 are automatically zero. Therefore, the maximally flat conditions [9] A. Narrowband Design Narrowband design uses second order linear phase structure for compensation (J=2) [9]. The transfer function is,…”

Section: Maximally Flat Compensatormentioning

confidence: 99%

“…These problems can be corrected to a certain extend by either modifying the conventional CIC structure, [2], [3], [4], [5], [6] or by cascading of a secondary filter, after the conventional one, to compensate its undesired characteristics, [7], [8]. A second order and fourth order maximally flat CIC passband compensator filter is designed in [9] which can be cascaded with CIC structure. Use of Chebyshev polynomials for stopband sharpening and its use in antenna arrays are presented in [10].…”

Section: Introductionmentioning

confidence: 99%

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FPGA implementation of an efficient cascaded integrator comb filter for narrow and wideband designs

Shaji

Jayaraj

2013

2013 International Conference on Control Communication and Computing (ICCC)

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Cascaded integrator-comb (CIC) digital filters are computationally efficient implementations of low pass filters. A characteristic that makes them popular in hardware devices is that they require no multiplication. For an ideal low pass filter, the passband part of the signal spectrum is multiplied by one and the stopband part of the signal by zero. The CIC filter has a poor magnitude response, that is, a high passband droop and a low attenuation in the folding bands. Thus the implementation of CIC filters should aim to provide better attenuation in the stopbands and reduced droop in the passbands. CIC filters are typically either followed or preceded by higher performance linear-phase low pass tapped delay-line FIR filters whose tasks are to compensate for the CIC filter's non-flat passband. This paper introduces a design and implementation of cascaded integrator comb with maximally flat passband using second order linear phase filter for narrowband compensation and fourth order linear phase filter for wideband compensation without using a separate compensator. Closed-form equations for the computation of the filter coefficients are provided. Here response sharpening with a Chebyshev polynomial is carried out to get an equiripple stopband. Computational complexity is reduced with the use of low-speed additions, and multiplications by small integer coefficients are converted to shift operations with powers of two. The many small stopbands of CIC are replaced with one large one. The optimized design uses a single Saram ki Ritoniemi structure to provide passband flatness and stopband sharpening simultaneously, making it suitable for FPGA implementation. Thus it can be effective in 1D receiver antenna array designs to create pencil beams.

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Section: Maximally Flat Compensatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

FPGA implementation of an efficient cascaded integrator comb filter for narrow and wideband designs

Shaji

Jayaraj

2013

2013 International Conference on Control Communication and Computing (ICCC)

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“…Different methods were proposed to compensate for the CIC passband droop. The compensators which need multipliers were proposed for example in [5] [6] [7]. However, due to lower power consumption, multiplierless compensators [8]- [13] are of more interest for SDR application.…”

Section: Introductionmentioning

confidence: 99%

Multiplierless Wideband and Narrowband CIC Compensator for SDR Application

Dolecek¹

2017

IJCNS

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This paper presents multiplierless CIC compensator for software-defined radio (SDR) application. The compensator is composed of two simple filters with sinewave form of magnitude responses. The parameters of the design are the sinewave amplitudes expressed as powers-of-two and estimated in a way to fulfill the absolute value of the maximum passband deviation of 0.25 dB and 0.05 dB, for the wideband and narrowband compensations, respectively. The proposed compensator requires maximum nine adders. The comparisons with the methods proposed in literature show the benefits of the proposed compensator.

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“…In paper [15] compensator based on maximally flat criterion is suitable for narrow-band as well as wide band applications is proposed. The nonrecursive methods proposed in [16,17] is used to improve the alias rejection in first folding band.…”

Section: Introductionmentioning

confidence: 99%

Improved Maximally Flat Wideband CIC Compensation Filter using Sharpening Technique

Devi¹,

Mehra²

2015

IJCA

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This paper presents the design and implementation of sharpening of maximally flat cascaded integrator comb compensation filters. The modified sharpened cascaded integrator comb compensation filter is used to improve magnitude response and gain. For wide-band compensation fourth-order linear phase filters is considered. The decimation factor of CIC filter is D and number of adders are depends upon decimation factor D. The compensation filter is a multiplier less design which works at low rate. The comparison within some methods reported in the literature is provided.

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Maximally Flat CIC Compensation Filter: Design and Multiplierless Implementation

Cited by 53 publications

References 12 publications

FPGA implementation of an efficient cascaded integrator comb filter for narrow and wideband designs

FPGA implementation of an efficient cascaded integrator comb filter for narrow and wideband designs

Multiplierless Wideband and Narrowband CIC Compensator for SDR Application

Improved Maximally Flat Wideband CIC Compensation Filter using Sharpening Technique

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