Mitigating Non-linear DAC Glitches Using Dither in Closed-loop Nano-positioning Applications

Ahmad Faza*, John Leth, Arnfinn A. Eielsen

*Corresponding author for this work

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

1 Citation (Scopus)

Abstract

Digital-to-analog conversion is essential in digital signal processing applications, including closed-loop control schemes. Noise and distortion in digital-to-analog converters result in reduced performance for high-precision mechatronics such as nano-positioning. Glitches are common in practical switched systems such as digital-to-analog converters; observed as an output disturbance. Due to the wide-bandwidth, impulse-like behavior, control law bandwidth is generally too low to provide adequate attenuation; deteriorating open and closed-loop performance. This article demonstrates how large-amplitude high-frequency periodic dither mitigates the effect of glitches in a nano-positioning system under closed-loop control. Simulations are performed using a model that includes significant non-linearities with a response fitted to an off-the-shelf commercial device, as well as using standard linear time-invariant models for other system components fitted to the responses of common, commercially available devices. The results highlight the significance of reconstruction filter design when applying dithering in this setting.

Original languageEnglish
Title of host publication2023 American Control Conference, ACC 2023
Number of pages7
PublisherIEEE
Publication date3 Jul 2023
Pages685-691
Article number10156386
ISBN (Print)978-1-6654-6952-4
ISBN (Electronic)979-8-3503-2806-6
DOIs
Publication statusPublished - 3 Jul 2023
Event2023 American Control Conference, ACC 2023 - San Diego, United States
Duration: 31 May 20232 Jun 2023

Conference

Conference2023 American Control Conference, ACC 2023
Country/TerritoryUnited States
CitySan Diego
Period31/05/202302/06/2023
SeriesProceedings of the American Control Conference
Volume2023-May
ISSN0743-1619

Bibliographical note

Publisher Copyright:
© 2023 American Automatic Control Council.

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