Design of Constant Phase Elements for Adjustable Pseudocapacitance by a Single Driving Voltage Using Integrated Unipolar Transistor Fields

Design of Constant Phase Elements for Adjustable Pseudocapacitance by a Single Driving Voltage Using Integrated Unipolar Transistor Fields

Článek WoS

This article presents the design of a passive fractional-order element with tunable pseudocapacitance, enabling adaptable circuit behavior without additional power consumption. This is an important feature for modeling and characterization in natural systems, as well as in the field of electrical and electronic engineering, particularly for the design of instrumentation and sensing systems. The proposed topologies are based on integrated unipolar transistor arrays. Two implementations are demonstrated, with fractional orders of 0.22 and 0.5, offering pseudocapacitance adjustment ranges from 65 to 1670 mikroF/s<^>0.78 and from 6.7 to 51 mikroF/s<^>0.5, respectively. Tuning is achieved through a DC bias voltage ranging from 0.8 to 10 V. The devices operate across nearly two decades of frequency, from approximately 100 Hz to 150 kHz, and support signal amplitudes in the hundreds of millivolts. Two application examples highlight their potential: electronic tuning of the center frequency in a fractional-order bandpass filter, and adjustment of the oscillation frequency in a fractional-order oscillator with a fixed 22.5(degrees) phase shift between output waves. All concepts and results are experimentally validated in the laboratory.

This article presents the design of a passive fractional-order element with tunable pseudocapacitance, enabling adaptable circuit behavior without additional power consumption. This is an important feature for modeling and characterization in natural systems, as well as in the field of electrical and electronic engineering, particularly for the design of instrumentation and sensing systems. The proposed topologies are based on integrated unipolar transistor arrays. Two implementations are demonstrated, with fractional orders of 0.22 and 0.5, offering pseudocapacitance adjustment ranges from 65 to 1670 mikroF/s<^>0.78 and from 6.7 to 51 mikroF/s<^>0.5, respectively. Tuning is achieved through a DC bias voltage ranging from 0.8 to 10 V. The devices operate across nearly two decades of frequency, from approximately 100 Hz to 150 kHz, and support signal amplitudes in the hundreds of millivolts. Two application examples highlight their potential: electronic tuning of the center frequency in a fractional-order bandpass filter, and adjustment of the oscillation frequency in a fractional-order oscillator with a fixed 22.5(degrees) phase shift between output waves. All concepts and results are experimentally validated in the laboratory.

Circuits, Circuits and systems, Filtering, Oscillators, Band-pass filters, Capacitors, Voltage multipliers, Active filters, Integrated circuits, Filters, Bias voltage adjustment, constant phase element (CPE), electronic adjustment, fractional-order, MOSFET, pseudocapacity, tunability

Circuits, Circuits and systems, Filtering, Oscillators, Band-pass filters, Capacitors, Voltage multipliers, Active filters, Integrated circuits, Filters, Bias voltage adjustment, constant phase element (CPE), electronic adjustment, fractional-order, MOSFET, pseudocapacity, tunability

ŠOTNER, R.; LITOVSKA, A.; POLÁK, L.; JERABEK, J.; KLEDROWETZ, V.; PROKOP, R.; JAIKLA, W.

01.01.2026

IEEE

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT

75

4/2026

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https://ieeexplore.ieee.org/document/11494898