Design and Multiplierless Realization of Maximally Flat Sharpened-CIC Compensators

Molnar, Goran; Dudarin, Aljoša; Vučić, Mladen

doi:10.1109/tcsii.2017.2700081

Cited by 32 publications

(31 citation statements)

References 17 publications

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“…The optimum coefficients and total number of adders used in the compensators are given in Table 1 together with passband droops of the original filters and the deviations of the compensated filters. In comparison with multiplierless SCIC compensators in [12], the proposed compensators generally bring lower deviations having significantly lower number of adders at the same time. It is expected since the compensators in [12] were obtained by using the maximally flat error criterion and without the control of complexity.…”

Section: Examplesmentioning

confidence: 99%

“…The compensators for CIC filters have been extensively studied for almost two decades (see [8][9][10][11] and the references therein). On the other hand, the compensators for SCIC filters have been introduced recently [12]. In both designs, it was found that the compensators with odd number of coefficients improve the response within a wider band than do the compensators with even number of coefficients.…”

mentioning

confidence: 99%

“…In both designs, it was found that the compensators with odd number of coefficients improve the response within a wider band than do the compensators with even number of coefficients. Furthermore, it was found that compensators with three [9,10,12] and five [9][10][11][12] coefficients usually suffice. Finally, most of these compensators were realised with coefficients expressed as sums of signed-power-of-two (SPT) terms, resulting in multiplierless structures.…”

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confidence: 99%

“…Compensator design: The amplitude response of Mth-order CIC filter can be considered as the Mth-order sharpened response of the first-order CIC filter [12]. Therefore, the amplitude responses of both filters, CIC and SCIC, can be expressed in a generalised form.…”

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confidence: 99%

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Optimum multiplierless compensators for sharpened cascaded‐integrator‐comb decimation filters

2018

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Folding band sharpening of the cascaded-integrator-comb filter results in a high passband droop. In applications requiring low passband deviation, the droop is reduced by connecting a low-order FIR compensator in cascade with the filter. In this Letter, the authors present a method for optimum design of compensators whose coefficients are expressed as sums of signed-power-of-two terms. The method is based on the minimisation of passband deviation, with specified total number of terms.

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Section: Examplesmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Optimum multiplierless compensators for sharpened cascaded‐integrator‐comb decimation filters

2018

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“…Some optimal hardware architectures of the compensation filter are presented in [7][8][9], but the signal aliasing is not discussed. The method that cascades the sharpened CIC and the corresponding compensation filter consumes more area [10].…”

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confidence: 99%

Efficient sharpening CIC filter embedding fifth‐order filter with coefficient optimisation algorithm

et al. 2020

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This Letter presents an optimised cascaded integrator comb (CIC) filter sharpening algorithm embedding a fifth-order finite impulse response filter, which improves the worst-case alias rejection and simultaneously compensates the passband droop. The sharpening filter is designed without multipliers, which reduces hardware complexity. The results of a fourth-order CIC filter design practice show that the proposed algorithm improves the worst-case alias rejection to 128 dB, meanwhile the passband distortion is only 0.015 dB.

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Comb decimator design based on symmetric polynomials with roots on the unit circle: Two‐stage multiplierless design and improved magnitude characteristic

Dolecek

2022

Circuit Theory & Apps

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This paper presents a theoretical background for design of comb decimator based on theorem of symmetric polynomials with roots on the unit circle. A simple multiplierless filter, called zero‐separation (ZS) filter, which separates doubled comb zeros, is derived. The separation of doubled comb zeros improves comb aliasing rejection. In order to get more benefits of the ZS filter, a two‐stage structure is considered. The classic comb filters are in both stages of the proposed structure. Additionally, in the second stage, a ZS filter is inserted to improve comb aliasing rejection. The passband droop is compensated by the compensator which works at low rate and is designed using particle swarm optimization (PSO). The method is illustrated with various examples. The comparisons with methods from literature prove the benefits of the proposed work.

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Design and Multiplierless Realization of Maximally Flat Sharpened-CIC Compensators

Cited by 32 publications

References 17 publications

Optimum multiplierless compensators for sharpened cascaded‐integrator‐comb decimation filters

Optimum multiplierless compensators for sharpened cascaded‐integrator‐comb decimation filters

Efficient sharpening CIC filter embedding fifth‐order filter with coefficient optimisation algorithm

Comb decimator design based on symmetric polynomials with roots on the unit circle: Two‐stage multiplierless design and improved magnitude characteristic

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