Publication detail
Differentiator circuits with scalable and electronically adjustable time constant and their application in phase shift evaluation
ŠOTNER, R. POLÁK, L. PETRŽELA, J. SEMENOV, D. LANGHAMMER, L. JAIKLA, W.
Original Title
Differentiator circuits with scalable and electronically adjustable time constant and their application in phase shift evaluation
Type
journal article in Web of Science
Language
English
Original 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.
Keywords
Differentiator; Electronic adjustment; Operational amplifier; Scaling; Phase shift measurement; Time constant; Variable gain amplifier
Authors
ŠOTNER, R.; POLÁK, L.; PETRŽELA, J.; SEMENOV, D.; LANGHAMMER, L.; JAIKLA, W.
Released
3. 5. 2025
Publisher
ELSEVIER
Location
AMSTERDAM
ISBN
2090-4495
Periodical
Ain Shams Engineering Journal
Year of study
16
Number
9
State
Arab Republic of Egypt
Pages from
1
Pages to
12
Pages count
12
URL
BibTex
@article{BUT198146,
author="Roman {Šotner} and Ladislav {Polák} and Jiří {Petržela} and Dmitrii {Semenov} and Lukáš {Langhammer} and Winai {Jaikla}",
title="Differentiator circuits with scalable and electronically adjustable time constant and their application in phase shift evaluation",
journal="Ain Shams Engineering Journal",
year="2025",
volume="16",
number="9",
pages="1--12",
doi="10.1016/j.asej.2025.103489",
issn="2090-4495",
url="https://www.sciencedirect.com/science/article/pii/S2090447925002308"
}