Differentiator circuits with scalable and electronically adjustable time constant and their application in phase shift evaluation

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dc.contributor.authorSotner, Roman
dc.contributor.authorPolak, Ladislav
dc.contributor.authorPetrzela, Jiri
dc.contributor.authorSemenov, Dmitrii
dc.contributor.authorLanghammer, Lukas
dc.contributor.authorJaikla, Winai
dc.date.accessioned2026-08-06T10:52:09Z
dc.date.available2026-08-06T10:52:09Z
dc.date.issued2025-09-01
dc.description.abstractTwo 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 µs (a ratio of maximal and minimal value 70) and from 8.7 µs to 183 µs (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.
dc.identifier.citationAin Shams Engineering Journal, 16(9), 2025
dc.identifier.doi10.1016/j.asej.2025.103489
dc.identifier.issn20904479
dc.identifier.other2-s2.0-105006880264
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/17241
dc.sourceAin Shams Engineering Journal
dc.subjectDifferentiator
dc.subjectElectronic adjustment
dc.subjectOperational amplifier
dc.subjectPhase shift measurement
dc.subjectScaling
dc.subjectTime constant
dc.subjectVariable gain amplifier
dc.titleDifferentiator circuits with scalable and electronically adjustable time constant and their application in phase shift evaluation
dc.typeArticle

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