Design of wideband CIC compensator filter for a digital IF receiver

Dolecek, Gordana Jovanovic; Harris, Fred

doi:10.1016/j.dsp.2009.03.013

Cited by 44 publications

(27 citation statements)

References 8 publications

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“…Note that the original sharpening has better passband characteristic while the modified sharpening method has higher attenuations in the folding bands. The number of authors presented different modifications of sharpening method, like (Jovanovic Dolecek, 2010b), (Laddomada & Mondin, 2004), (Jovanovic Dolecek & Harris, 2009). In (Jovanovic Dolecek & Mitra, 2010), the two-stage CIC filter with the compensator (10) has been proposed.…”

Section: Methods For the Passband And Stopband Improvementmentioning

confidence: 99%

On Design of CIC Decimators

Díaz-Carmona¹,

Dolecek²

2011

Applications of MATLAB in Science and Engineering

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Section: Methods For the Passband And Stopband Improvementmentioning

confidence: 99%

On Design of CIC Decimators

Díaz-Carmona¹,

Dolecek²

2011

Applications of MATLAB in Science and Engineering

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“…Compensator filters [2][3][4][5][6] decrease the comb passband droop, while the most common structures that improve attenuation in the folding bands are based on zero-rotating [7][8][9][10]. Methods that simultaneously improve passband and stopband are traditionally based on the sharpening technique [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Applications of corrector filters to improve magnitude response of comb decimation filter

Baez

Dolecek

2014

2014 IEEE 57th International Midwest Symposium on Circuits and Systems (MWSCAS)

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This paper presents the application of simple multiplierless filters that decrease the passband droop and increase alias rejection in the folding bands of comb filters. Comparisons with some methods proposed in literature are also included, showing the benefit of the proposed approach. It is also proved that the method is convenient for the traditional non-recursive comb structure with a decimation factor that is a power of two. In that way, the magnitude characteristics of the structure are significantly improved, while keeping power efficiency of the original structure, by placing three simple filters in the last two stages.

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“…There are two major drawbacks of the conventional filters which are the large passband droop and limited stopband attenuation. 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.…”

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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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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Design of wideband CIC compensator filter for a digital IF receiver

Cited by 44 publications

References 8 publications

On Design of CIC Decimators

On Design of CIC Decimators

Applications of corrector filters to improve magnitude response of comb decimation filter

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

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