Delta-Sigma Modulators and Decimation Filters

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Concluding Remarks Purpose of decimation filters : Antialias filtering followed by sample rate reduction Multistage Decimation preferred to single stage Popular structure consists of a Cascaded Integrator comb followed by one or two FIR stages
References E. B. Hogenauer, “An Economical Class of Digital Filters for Decimation and Interpolation,” IEEE Trans. Acoustics, Speech and Signal Processing, vol. ASSP-29, no. 2, pp. 155-162, April 1981. Alan Y. Kwentus, Zhongnong Jiang and Alan N. Wilson Jr., “Application of filter sharpening to Cascaded Integrator-Comb decimation filters”, IEEE Transactions on Signal Processing,45(2):457-467,1997. Lyons, Richard, Understanding Digital Signal Processing, 2nd Ed., Prentice Hall, Upper Saddle River, New Jersey, 2004, pp. 556-561. http://www.academicjournals.org/ijps/PDF/pdf2011/18Jun/Rat an%20et%20al.pdf http://www.design-reuse.com/articles/10028/understandingcascaded-integrator-comb-filters.html http://en.wikipedia.org/wiki/Cascaded_integrator-comb_filter
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Delta-Sigma Modulators and Decimation Filters

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