Analysis of Harmonic Distortion of Sigma-Delta Modulator

Abstract:

In this paper, the harmonic distortion of fourth-order sigma-delta modulator is analyzed. Based on the analysis non-ideal models are established and simulation results demonstrated the validity of these models. The non-linear capacitors introduce harmonic distortion and the non-linear on-resistance nearly only introduce second order harmonic distortion. The non-ideal integrators can increase the noise floor of the modulator.The fully-differential topology can be adopted to eliminate even order harmonic distortion and the operational amplifier with high performance can also be used to decrease noise floor of the modulator.

• Periodical: Key Engineering Materials (Volumes 645-646)
• Pages: 980-985
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.645-646.980
• Online since: May 2015
• Authors: Dong Yan*, Wen Ning Jiang, Si Qi Tao, Jian Yang, Liang Yin, Xiao Wei Liu
• Keywords: Non-Linearity, Sigma-Delta Modulator, Single-Loop, THD

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