Fractional-Order Phase Shifters with Constant Magnitude Frequency Responses
Loading...
Date
2019-10-10
Authors
Šotner, Roman
Langhammer, Lukáš
Jeřábek, Jan
Ushakov, Peter A.
Dostál, Tomáš
Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
Kaunas University of Technology
Altmetrics
Abstract
This contribution presents and experimentally analyzes the idea how to reach the constant magnitude as well as the phase response in the fractional-order (FO) phase when shifting two-ports. The straightforward method employing the automatic gain control circuit (AGC) in a cascade after so-called constant phase block approximating FO integrator or differentiator is studied. The variable gain amplifier utilized in AGC and simple RC-based FO constant phase elements (approximating capacitors with order alpha = 1/4 and alpha = 1/2 as an example) connected in the feedback of operational amplifier-based integrator are established in the experimental setup. The operation indicated in three decades (between 100 Hz and 100 kHz) is evaluated. The known solutions of the standard FO phase shifting circuits are discussed and generally compared with the features obtained in this paper, together with the supposed effects of AGC on their performances.
Description
Citation
Elektronika Ir Elektrotechnika. 2019, vol. 25, issue 5, p. 25-30.
http://eejournal.ktu.lt/index.php/elt/article/view/24352
http://eejournal.ktu.lt/index.php/elt/article/view/24352
Document type
Peer-reviewed
Document version
Published version
Date of access to the full text
Language of document
en