Article 9420

Title of the article

SIMULATION RESULTS ANALYSIS OF METHODS TO COMPENSATE ERRORS CAUSED BY BOUNDARY EFFECTS IN ΣТ-ADC 

Authors

Ashanin Vasiliy Nikolaevich, Candidate of engineering sciences, associate professor, head of the sub-department of electric power and electrical engineering, Penza State University (40 Krasnaya street, Penza, Russia), E-mail: eltech@pnzgu.ru
Korotkov Aleksey Aleksandrovich, Design engineer, Research Institute of Electronic and Mechanic Devices (44 Karakozova street, Penza, Russia); postgraduate student, Penza State University (40 Krasnaya street, Penza, Russia), E-mail: lexifer@mail.ru 

Index UDK

681.325.3 

DOI

10.21685/2072-3059-2020-4-9 

Abstract

Background. The greatest linearity of a conversion function and word length of an output code information converters with ΣΔ-architecture have today. However, existence in their structure of the digital filter-decimator does not allow realizing a binding of result of measurement by the time of measurement. To ensure this most important property of information converters Σ -architecture for measuring tasks, it is advisable to use other types of intermediate modulation, for example, pulse-width modulation (PWM). A comparative analysis of the algorithms of the integrating ΣT analog-digital converter (ADC) is carried out, in which, in order to eliminate digital filtering of the output signal of the modulator, an intermediate pulse-width modulated signal is summed in adjacent conversion cycles for a time that is many times longer than the pulse modulation period. To exclude the operation of filtering the results of intermediate modulation, the error compensation from edge effects is used. Researches were carried out using the developed simulation models, which use analog, combined and digital methods for compensating the error from edge effects.
Materials and methods. Simulation models were created in the Matlab/Simulink software environment. A number of model experiments have been carried out and the values of the standard deviation of linearity of the ADC conversion function without compensation, as well as with analog, combined, and digital compensation of the error from edge effects, are calculated. The performance of the algorithms is assessed and a comparative analysis of the implemented algorithms is carried out.
Results. The indices of the standard deviation of linearity confirm the correctness of the implementation of the algorithms in the software environment and the effectiveness of the simulation models of the ΣT-ADC with analog, combined and digital compensation of the error from edge effects.
Conclusions. The implemented ΣT-ADC algorithm with digital compensation significantly reduces the error from edge effects, which is confirmed by the obtained values of the standard deviation of linearity, and is the simplest from the point of view of model and practical implementation. 

Key words

ΣТ-ADC, pulse-width modulation, analog compensation, digital compensation, combined compensation, correction, error from edge effects, simulation model, standard deviation of conversion results 

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References

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Дата создания: 17.02.2021 12:14
Дата обновления: 17.02.2021 13:03