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Supervised by Ministry of Industry and Information Technology of The People's Republic of China Sponsored by Harbin Institute of Technology Editor-in-chief Yu Zhou ISSNISSN 1005-9113 CNCN 23-1378/T

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Disturbance observer design with a bode’s ideal filter for Sigma-Delta modulator
Author NameAffiliationPostcode
Chi Xu College of Information Science and Technology, Beijing University of Chemical Technology 100029
yu Jin* College of Information Science and Technology, Beijing University of Chemical Technology 100029
Hang Liu College of Information Science and Technology, Beijing University of Chemical Technology 100029
Duli Yu Advanced Innovation Center for Soft Matter, Beijing University of Chemical Technology 100029
Abstract:
It is usually difficult to design a high performance Sigma-Delta (ΣΔ) modulator due to system noises. In this paper, a disturbance observer (DOB) is utilized to estimate the system noises and eliminate their effects on ΣΔ modulators. The applied DOB is introduced with a Bode’s ideal cut-off (BICO) filter used for the Q-filter. The proposed DOB with the BICO filter used in ΣΔ modulators can achieve better noise-shaping ability, resulting from the less phase loss of the BICO filter. Finally, the simulation results show that the proposed BICO filter scheme is a useful additional tool for improving the performance of ΣΔ modulators.
Key words:  DOB  ΣΔ modulator  BICO filter  noise-shaping  fractional-order system
DOI：10.11916/j.issn.1005-9113.18066
Clc Number:TP212,TN432
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