Single VDTA-Based Tunable Floating Lossy Inductance Simulation Circuits

Abstract

In this study, two circuit topologies for simulating tunable lossy floating inductors are proposed. In each design, the simulators make use of a single voltage differencing transconductance amplifier (VDTA), and only two passive elements with a grounded capacitor. The proposed active inductance simulators do not need some kind of component matching conditions and cancellation constraints for the desired realization. Besides, the simulated equivalent resistance and inductance values are independently tunable through a single resistor and/or the transconductances of the VDTA. The workability of all the proposed circuits is well accomplished through PSPICE simulations and experimental test results. To ascertain the feasibility of the proposed inductor designs, they are used to construct a fourth-order equal-ripple (3-dB) lowpass filter and an electronically tunable sinusoidal oscillator.

KEYWORDS:

• Inductance simulator
• Lossy inductor
• RL impedance
• Voltage differencing transconductance amplifier (VDTA)

ACKNOWLEDGEMENTS

This work was supported by King Mongkut’s Institute of Technology Ladkrabang. The authors are deeply indebted to the anonymous reviewers for their helpful comments and suggestions.

Additional information

Funding

This work was supported by King Mongkut’s Institute of Technology Ladkrabang.

Notes on contributors

Pitchayanin Moonmuang

Pitchayanin Moonmuang received her BEng degree (Honors) in electronics engineering, and MEng degree in control engineering both from the Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang (KMITL), Bangkok, Thailand, in 2016 and 2019, respectively. During her masters, she created several adjustable capacitance multiplier circuits, which resulted in conference presentations and published papers. She is currently a doctoral student in electrical engineering at KMITL. Pitchayanin's current research revolves mostly around the areas of immittance function simulators and active analog filter design. E-mail: [email protected]

Worapong Tangsrirat

Worapong Tangsrirat received the BIndTech degree (Honors) in electronics engineering, and MEng and Deng degrees in electrical engineering all from Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang (KMITL), Bangkok, Thailand, in 1991, 1997, 2003, respectively. Since 1995, he has been a faculty member at KMITL, where he is currently a Full Professor in electrical engineering at the Department of Instrumentation and Control Engineering. Professor Worapong's research interests are primarily in the areas of analog signal processing and integrated circuits, current-mode circuits, and active filter and oscillator design. He has edited or written 15 books, and has had more than 100 research articles published in peer reviewed international journals. E-mail: [email protected]