A 4th-Order Wideband Sigma Delta Modulator Using Linear System Theory Technique

Ren, Mingyuan; Zhang, Yongsheng; Wu, Weikun; Bao, Zhen-xi; Zhao, Ziwei; Li, Chao; Zhang, Hongguo

doi:10.14257/ijsip.2016.9.1.20

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…By pushing most of the in-band noise outside the signal frequency band good signal-to-noise ratio can be achieved, which can be implemented if the signal transfer function is a low-pass, whereas and noise transfer function is high-pass. This technique is known as noise shaping that can be efficiently implemented by modifying the existing delta modulator (Ren et al , 2016; Brigati et al , 2004; Zare-Hoseini et al , 2003; Brigati et al , 2002).…”

Section: Introductionmentioning

confidence: 99%

A novel system-level modeling and design approach for high performance single-loop sigma-delta (∑Δ) modulators

Krishna

Reddy²,

Reddy

2021

IJIUS

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Purpose This paper attempted a novel approach for system-level modeling and simulation of sigma-delta modulator for low-frequency CMOS integrated analog to digital interfaces. Comparative analysis of various architectures topologies, circuit implementation techniques are described with analytical procedure for effective selection of topologies for targeted specifications. Design/methodology/approach Virtual instruments are presented in labview environment to analyze the correlation of circuit-level non-ideal effects with key design parameters over sampling ratio, coarse quantizer bits and loop filter order. A fourth-order single-loop sigma-delta modulator is designed and verified in MATLAB simulink environment with careful selection of integrator weights to meet stable desired performance. Findings The proposed designed achieved SNDR of 122 dB and 20 bit resolution satisfying high-resolution requirements of low-frequency biomedical signal processing applications. Even though the simulation performed at behavioral level, the results obtained are considered as accurate, by including all non-ideal and non-linear circuit errors in simulation process. Originality/value Virtual instruments using labview environment used to analyze the correlation of circuit-level non-ideal effects with key design parameters over sampling ratio, coarse quantizer bits and loop filter order for accurate design.

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