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http://dx.doi.org/10.6109/jkiice.2015.19.11.2649

Design and Analysis of Decimation Filers with Minimal Distortion for a High Speed High Performance Sigma-Delta ADC  

Kang, Ho-jin (Department of Electronic Engineering, Chungbuk National University)
Kim, Hyung-won (Department of Electronic Engineering, Chungbuk National University)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.19, no.11, 2015 , pp. 2649-2655 More about this Journal
Abstract
While the oversampling sigma-delta ADCs are known to have high resolution, they often suffer from SNDR losses when operated at a very high data clock. This paper presents a design and implementation of a decimation filter that provides minimum distortion at passband for high-speed sigma-delta ADC. The proposed digital decimation filter employs a butterworth structure. To evaluate the performance of the proposed decimation filter, we implemented a 1-bit, third-order, OSR=64 sigma-delta modulator followed by the proposed decimation filter. Using the simulation ad measurement, we compared the performance of the proposed decimation filter with a conventional CIC(cascaded integrator comb) decimation filter, which is commonly used in most sigma-delta ADCs. The measurement results show that the proposed decimation filter presents substantially lower distortion at passband and thus can provide must higher SNDR.
Keywords
Sigma-Delta ADC; Decimation Filter; CIC Filter; Butterworth Filter;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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