• Nasir N. Hurrah
• Nazir A. Loan
• Shabir A. Parah

Presently Sigma-Delta (ΣΔ) analog to digital converters (ADCs) are the best suited for implementing architectures in nm CMOS technology. The applications of ΣΔ ADCs are increasing with time in different areas like wideband applications (SDR, LTE etc), audio and medical domains. The work in this paper focused on the designing of the decimation filter by modifying the already present architectures with different approaches and techniques. The proposed filter has been targeted for wideband applications. The algorithms and the filter structures chosen are hardware realizable in which area is the most important constraint. The suitable area optimization techniques are applied in each case to minimize area of the device targeted. The designed filter was targeted for being implemented in FPGA kit. The designed and implemented digital decimation filter consists of six stages (Comb-HBF-FIR) for high-resolution delta-sigma applications. Shift and add operations are used to implement multiplications of CSD-encoded coefficients. HDL synthesis has been preferred choice to implement the functions, including the storage of coefficients and computation, instead of RAM and ROM due to its time-to-market advantage. Experimental results show that use of multi-stage structure, with a proper selection of the decimation factor and filtering stage, ensures efficient performance of decimation filter. It has been shown that use of both non-recursive and recursive comb filters results in reduction in word-lengths as achieved by proposed architecture and thereby an area optimized decimation filter is obtained.

Analog to Digital Converter, Decimation filter, FIR filter, FPGA.

"Area Optimized Decimation Filter for Wideband ΣΔ Analog to Digital Converters", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 2, page no.334-341, February-2019, Available :http://www.jetir.org/papers/JETIR1902944.pdf

"Area Optimized Decimation Filter for Wideband ΣΔ Analog to Digital Converters", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 2, page no. pp334-341, February-2019, Available at : http://www.jetir.org/papers/JETIR1902944.pdf