Differentiator circuits with scalable and electronically adjustable time constant and their application in phase shift evaluation
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Date
2025-05-03
Authors
Šotner, Roman
Polák, Ladislav
Petržela, Jiří
Semenov, Dmitrii
Langhammer, Lukáš
Jaikla, Winai
0000-0002-2430-1815Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
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Abstract
Two novel scalable and electronically adjustable differentiator designs are presented in this paper. These designs are based on special variable gain amplifiers extending well-known concept of standard single operational amplifier-based differentiators. The key novelty lies in their scalability, which allows for an enhanced time constant value by adjusting the ratio of resistors. Simultaneously, the special form of gain control using a DC voltage offers wide electronic tunability. The solution performs high input and low output impedance, both independent of frequency. Experimental testing demonstrated time constant adjustments in two configurations: from 64 ns to 4.5 mu s (a ratio of maximal and minimal value 70) and from 8.7 mu s to 183 mu s (a ratio of 21). As an application example, the proposed differentiator is utilized in the design of a readout system for an absolute phase shift difference to pulse width ratio converter, suitable for monitoring a very slow phenomenon such biosignals.
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Citation
Ain Shams Engineering Journal. 2025, vol. 16, issue 9, p. 1-12.
https://www.sciencedirect.com/science/article/pii/S2090447925002308
https://www.sciencedirect.com/science/article/pii/S2090447925002308
Document type
Peer-reviewed
Document version
Published version
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Language of document
en