Preprint / Version 1

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

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DOI:

https://doi.org/10.31224/2900

Keywords:

dither, glitch reduction, Nanopositioning, digital analogue conversion, nonlinear distortion, motion control, disturbance reduction

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; ob- served 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.

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Posted

2023-03-22