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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An overview of decimator structures for efficient sigma-delta converters: Semantic Scholar estimates that this publication has citations based on the available data.
Design of Modified Three Stage Sharpened CIC Filter for Decimation | Open Access Journals
Molnar G, Od M. In this work, it is shown that, for stringent magnitude specifications, sharpening compensated comb filters requires a lower-degree sharpening polynomial compared to sharpening comb filters without compensation, resulting in a solution with lower computational complexity. For this example, the APOS in Table 1 corresponds to the second-stage filter the first-stage filtering is the same filterz both solutions and therefore it is omitted.
This is done in order to achieve an equiripple passband deviation in the overall filter H TS z. The proposed filtering structure and the corresponding guidelines to decide when to use sharpened compensated filters instead of sharpened comb cascaedd without compensation are introduced intgrator-comb Section 4. For more rigorous analysis of the results, the pass-band as well as stop-band of Fig. In two-stage comb-based decimation schemes, magnitude response improvements over the passband and the first folding band can be achieved by improving only the second-stage comb filter.
The reasons at the very basis of this work stem from the following observations. Further, this structure also improves the overall throughput rate.
This class of filters require neither multipliers nor storage elements and therefore uses fewer resources as compared to other available filter structures. Decimation signal processing Search for additional papers on this topic. Support Center Support Center. The frequency response can be improved by multi-stage implementation approach . Citation Statistics Citations 0 10 20 ’99 ’03 ’08 ’13 ‘ So, after replacing, the transfer function of sharpened CIC filter is given by eq.
Clearly, the proposed structure can have a lower computational complexity i.
Application of filter sharpening to cascaded integrator-comb decimation filters
Untegrator-comb, in methods [ 2324 ] the filter designer does not have control on the exact passband deviation and stopband attenuation achieved by the designed filter. From the representative sample of works improving the magnitude characteristics of comb filters, we observe that the rotated-comb-based schemes [ 2 — 7 ] have the disadvantage of being susceptible to imperfect pole-zero cancelation.
Skip to search form Skip to main content. A new modified comb-rotated sinc RS decimator with improved magnitude response. However, the work [ 34 ] does not provide any method to find optimal discrete coefficients and simple rounding has been applied to the infinite precision solution, making pointless the infinite-precision optimization.
When this structure is chosen, the second-stage comb filter must be carefully designed since this is the filter where the worst-case magnitude characteristic of the overall cascade does occur. National Center dharpening Biotechnology InformationU. The jntegrator-comb and multiplier-less realization of software radio receivers with reduced system delay.
Optimal Sharpening of Compensated Comb Decimation Filters: Analysis and Design
Here M is the decimation factor. Open in a separate window.
The second-stage filtering cascadev at lower rate as well, but it can take advantage of CIC-like architectures for area reduction. Showing of extracted citations. This filter sharpening technique is applied to CIC filters to reduce the pass-band droop and to improve stop-band attenuation in CIC filters.
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. A high speed digital decimation filter with parallel cascaded integrator-comb pre-filters.
It introduced the use of two multipliers in CIC structure, but this method did not provided any improvement in pass-band of the filter. Proposed Sharpened Compensated Comb Filters Let us consider as subfilter the simplest compensated comb filter, which has the following transfer function [ 11 ]: 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 as second stage.
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.
The comb section consists of simplest low-pass finite-impulse response FIR filter which is M point moving-average filter with an impulse response. Design examples are presented in Section 7 where the goal is to contrast the magnitude responses of the proposed method against existing techniques, namely, the ones based on traditional Kaiser and Hamming sharpening and the Chebyshev sharpening methods recently proposed in the literature.
Design of Modified Three Stage Sharpened CIC Filter for Decimation
An economical class of droop-compensated generalized comb filters: This filter is identified by H a z. However, K can only take even values, whereas N can also be odd.
Moreover, method [ 34 ] is focused on sharpening traditional comb filters without compensation.