Designing and optimizing of a novel sigma-delta modulator using PSO algorithm

Chi Xu1, Yu Jin2, Duli Yu3

1, 2College of Information Science and Technology, Beijing University of Chemical Technology,
Beijing, China

3Advanced Innovation Center for Soft Matter, Beijing University of Chemical Technology, Beijing, China

2Corresponding author

E-mail: 12016400134@mail.buct.edu.cn, 2jiny@mail.buct.edu.cn, 3dyu@mail.buct.edu.cn

Received 5 September 2017; accepted 11 September 2017

DOI https://doi.org/10.21595/vp.2017.19098

 

Abstract. The performance of the conventional Sigma-Delta modulator can be improved by cascading electrical integrator behind the mechanical sensing element. In this paper, a novel Sigma-Delta modulator with a fractional-order controller is proposed and thus extending the traditional Sigma-Delta modulator to a new fractional-order in the Sigma-Delta ADC design field. The fractional-order controller allows fine tuning accuracy in seeking the coefficients for the proposed Sigma-Delta modulator and provides the robust stability in the placement of poles and zeros for compensating the phase delays. The parameters of the proposed fractional-order Sigma-Delta modulator is designed by using swarm intelligent algorithm, which offers opportunity to simplify the process of tuning parameters and further improve the noise performance. Simulation from the proposed fractional-order Sigma-Delta modulator, results of SNR > 134 dB and the noise floor under 170 dB are obtained in frequency range of [5-150 Hz].

Keywords: fractional-order system, sigma-delta modulator, system stability, pso algorithm.

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Cite this article

Xu Chi, Jin Yu, Yu Duli Designing and optimizing of a novel sigma‑delta modulator using PSO algorithm. Vibroengineering PROCEDIA, Vol. 14, 2017, p. 358‑363.

 

JVE International Ltd. Vibroengineering PROCEDIA. Oct 2017, Vol. 14. ISSN 2345-0533