APPLICATION OF FILTER SHARPENING TO CASCADED INTEGRATOR-COMB DECIMATION FILTERS PDF

A new architecture for the implementation of high-order decimation filters is described. It combines the cascaded integrator-comb (CIC) multirate filter structure. Application of filter sharpening to cascaded integrator-comb decimation filters. Authors: Kwentus, A. Y.; Jiang, Zhongnong; Willson, A. N.. Publication. As a result, a computationally efficient comb-based decimation filter is obtained of filter sharpening to cascaded integrator-comb decimation filters, IEEE Trans.

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Proposed Sharpened Compensated Comb Filters Let us consider as subfilter the simplest compensated comb filter, which has the following transfer function [ 11 ]: Obviously, this is a preliminary estimation that depends on the accuracy of the formula being used. This paper proposed an optimization framework to design sharpening polynomials specifically suited to comb-based decimation filtering.

Saramaki T, Ritoniemi T. An economical class of digital filters for decimation and interpolation. However, we must have monotonic magnitude characteristic over the passband region of the filter to be sharpened.

Application of filter sharpening to cascaded integrator-comb decimation filters

The main motive of this paper is to design a Sharpened decimation filter based on filterrs technique [12] with all the integrated advantages of existing scheme in order to achieve the better frequency response in pass-band as well as stop-band as compared to existing CIC structures for decimation. Citations Publications citing this paper. The optimization framework to design sharpened compensated comb filters along with the o design steps is provided in Section 5.

Note that K must be an even value to avoid fractional delays. Practical design rules for optimum finite impulse response low pass digital filters. The CIC filter at first stage operates at input sampling rate, sharpened second stage operates at lower rate as compared to first stage and sharpened third stage operates at lower rate as compared to first as well spplication second stage. However, in methods [ filtdrs24 ] the filter designer does not have control on the exact passband deviation and stopband attenuation achieved by the designed filter.

Stepped triangular CIC-cosine decimation filter. The authors proposed the multistage design which consists of cascading of regular comb stages and sharpened comb stages. Thus the second sharpened stage operates at lower sampling rate which is M1 times lower than the input sampling rate.

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From This Paper Figures, tables, and topics from this paper. These cases are shown in Figure 2. Please review our privacy policy. Closed-form design of cic compensators based on maximally flat error criterion. Moreover, two-stage comb-based decimation schemes have gained great popularity because the comb decimation filter in the first stage, designed in nonrecursive form, can be implemented at lower rate by polyphase decomposition, thus resulting in lower power consumption. An improved search algorithm for the design of multiplierless FIR filters with powers-of-two coefficients.

In that case, sharpened compensated comb filters become convenient when. The simulation results also verify the design of proposed sharpened decimation filter. Here,Fsisinput sampling frequency rate. On the other hand, the techniques relying on sharpening of comb-based filters in [ 18 — 24 ] are effective because they can take advantage of the structure proposed in [ 18 ], which filtsrs the recursive form of comb filters resulting in Cascaded Integrato-rcomb Comb- CIC- like architectures that move part of the filtering at lower rate.

integratro-comb

Here is phase shift parameter and it can be ignored. Sharpening method by Kaiser and Hamming [12] gives the idea of filter sharpening by multistage use of the same filter. The simulation results and their comparison shows that the proposed decimation filter has improved pass-band droop and better stop-band alias rejection than the existing structures.

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Skip to inteyrator-comb form Skip to main content. However, the magnitude response of comb filters presents a droop in the passband region and low stopband attenuation, which is undesirable in many applications.

The proposed sharpened filter produced much better improvement in pass-band droop and better alias rejection in stop-band than the existing conventional CIC filter shafpening and modified sharpened CIC filter [11] for the same decimation factor.

Modified comb filter structure for decimation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Therefore, preserving a simple sharpening polynomial and improving the stopbands with the increase of Kas suggested in [ 23 ], do not guarantee a result with low computational complexity. Various sharpening techniques have been proposed to improve the frequency response of CIC filter [].

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It is interesting to note that, with the proposed sharpening approach, we can obtain an overall magnitude response attaining desired passband and stopband deviations by improving only the second-stage filter.

Due to that simplicity, it is inferred in [ 23 ] that the resulting sharpened compensated comb filter will have a low computational complexity.

Section 6 highlights the characteristics to be considered for the sharpening of the second-stage filter in a two-stage comb-based architecture.

The following examples are discussed to show the improvement of magnitude characteristics of comb filters achieved with the proposed method in comparison to other sharpening-based schemes recently introduced in the literature.

Introduction Efficient decimation filtering for oversampled discrete-time signals is key in the development of low-power hardware platforms for reconfigurable communication transceivers [ 1 — 26 ]. A novel two-stage nonrecursive architecture for the design of generalized comb filters. For the comb-based decimation filter, the range limits for X p and X s are. Topics Discussed in This Paper.

Application of filter sharpening to cascaded integrator-comb decimation filters

High-speed sharpening of decimating CIC filter. However, K can only take even values, whereas N can also be odd. When it comes to the complexities in terms of APOS, the proposed solution achieves better results too. Examples and Discussion of Results The following examples are discussed to show the improvement of magnitude characteristics of comb filters achieved with the proposed method in comparison to other sharpening-based schemes recently introduced in the literature.

Showing of 9 references. The three stage implementation of proposed sharpened decimation filter in Matlab-Simulink is shown in Fig. A new modified comb-rotated sinc RS decimator with improved magnitude response.

Optimal Sharpening of Compensated Comb Decimation Filters: Analysis and Design

Instead of sharpening all the comb stages, sharpening technique is applied to the last stage which provided very good results. National Center for Biotechnology InformationU. From a practical point of view, decimation is usually integratof-comb using a cascade of two or more stages. Therefore the response of CIC filter can be represented as.