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IJSTR >> Volume 2- Issue 5, May 2013 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Design Of Multirate Linear Phase Decimation Filters For Oversampling Adcs

[Full Text]



Phanendrababu H, ArvindChoubey



Index Terms: Cascaded integrator comb, decimation, finite impulse response filters, multi-rate, linear phase, Delta-Sigma ADC Minimum



Abstract:This brief presents the design of a audio pass band decimation filter for Delta-Sigma analog-to-digital converters. The contribution of this work is the implementation of a multi-rate system of Finite Impulse Response (FIR) decimation filters of linear phase supporting decimation ratios of 32 to 128. A three-stage decimation filter with down-sampling factor of 128 is developed. A fourth-order CIC (Cascaded Integrator-Comb) filter which reduces the sampling rate by 32 is implemented non-recursively using cascaded form of realization in first stage. Two half band filters follow the CIC filter each reducing the sampling rate by two. The resulting filters features less pass band droop and higher folding-band attenuation than traditional filters. The system level analysis of the design is done on MATLAB and comparisons with other works in literature are provided.



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