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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The implementation of second and third sharpened stage is shown in Fig. Support Center Support Center. So, after replacing, the transfer function of sharpened CIC filter is given by eq.

Thus the proposed work can be extended to design decimation filters of any decimation factor and order that can be efficiently applied to many modern multirate applications like digital modems, sampling rate equalization in GSM, 3G, 4G, WiMax and other modern communication systems.

Kaiser and Hamming[11] proposed a method to sharpen the magnitude response of a digital filter by using multiple realizations of low-order basic filters. Applicatjon this setup, we have. The sharpened second and third stage leads to improvement in pass-band droop and better stop-band alias rejection. Application of filter sharpening to cascaded integrator-comb decimation filters. In this case, the proposed sharpened decimation filter has shown a much better improvement in pass-band droop and a little improvement in stop-band alias rejection as compared to existing conventional CIC filter [2] and modified sharpened CIC filter [11].

Sharpening method by Kaiser and Hamming [12] gives the idea of filter fjlter by multistage use of the same filter. Due to ingegrator-comb simplicity, it is inferred in [ 23 ] that the resulting sharpened compensated comb filter will have a low computational complexity. However, generally speaking, sharpened compensated comb filters become effective as the passband and stopband specifications become more stringent. Figure 4 shows the magnitude response characteristics of these filters along with passband and first folding band details.

A high speed digital decimation filter with parallel cascaded integrator-comb pre-filters.

Design of Modified Three Stage Sharpened CIC Filter for Decimation

Application of amplitude transformation for compensation of comb decimation filters. Analog and Digital Signal Processing, Vol. Simple method for compensation of CIC decimation filter.

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Bell System Technical Journal. But the overall frequency response does not meet the design specification of various multirate systems. Comb filters are a class of low-complexity filters especially useful for multistage decimation processes. Optimal Sharpening of CIC filters and an efficient implementation through Saramaki-Ritoniemi decimation filter structure.

Once the vector s has been obtained, the sharpening coefficients can be found as follows:. Decimation signal processing Search for additional papers on this topic. An effective way to prevent this problem consists in designing nonrecursive filters [ 347 ] with filtering implemented in polyphase form for ensuring power savings. Design examples are presented in order to show the performance improvement in terms of passband distortion and selectivity compared to other methods based on the traditional Kaiser-Hamming sharpening and the Chebyshev sharpening integratod-comb recently introduced in the literature.

Comb filters are used in the first stage of the decimation chain because their intevrator-comb function is simple and it does not require any multiplier. It introduced the use of two multipliers in CIC structure, but this method did not provided any improvement in pass-band of the filter. See our FAQ for additional information. On the use of interpolated second-order polynomials for efficient filter design in programmable downconversion.

Decimation signal processing Cascaded integrator—comb filter Coefficient. A new two-stage sharpened comb decimator. Author information Article notes Copyright and License information Disclaimer.

Further, this structure also improves the overall throughput rate. This is an open access article distributed under the Creative Commons Attribution License, which cascader unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Further the third stage operates at M2 times the lower sampling rate than the second stage and the frequency response of second stage is further sharpened by third stage.

The proposed filter, on the other hand, achieves better passband droop correction, which meets the 0. The method is based on idea of amplitude change function ACF that is restricted to symmetric FIR filter with constant pass band and stop band.

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The above discussed sharpening technique is efficiently applied in multistage configuration to improve the response of proposed filter over existing structures.

Introduction Efficient shagpening filtering for oversampled discrete-time signals is key in the development of low-power hardware platforms for reconfigurable communication transceivers [ 1 — 26 ].

Application of filter sharpening to cascaded integrator-comb decimation filters – Semantic Scholar

This filter is identified by H a z. In the passband, the behaviors of filters proposed in [ 2223 ] are similar. This architecture achieves better resource utilization over existing approaches because in this structure the first stage CIC decimation filter is followed by a fixed-coefficient second-stage filter rather than a programmable-coefficient filter.

Problem Motivation, Contributions, and Paper Organization The reasons at the very basis of this work stem from the following observations. In this case, the proposed sharpened decimation filter has shown a little improvement in pass-band droop and stop-band alias rejection as compared to existing conventional CIC filter [2] and modified sharpened CIC filter [11].

But the decimation process leads to aliasing and imaging errors [1]. Conflict of Interests The authors declare that there is no conflict of interests regarding the publication of this paper. However, in methods [ 2324 ] the filter designer does not have control on the exact passband deviation and stopband attenuation achieved by the designed filter.

An overview of decimator structures for efficient sigma-delta converters: The optimized sharpening coefficients are finite-precision values resulting in multiplierless structures, which are important for low-power applications.

Application of filter sharpening to cascaded integrator-comb decimation filters

The main motive of this paper is to design a Sharpened decimation filter with all the integrated advantages of existing techniques in order to achieve the better frequency response than the CIC based existing structures.

Closed-form design of cic compensators based on maximally flat error criterion. These approaches provide low-complexity solutions, but the passband improvement cannot be completely controlled.