Actively Floating Lossy Inductance Simulators Using Voltage Differencing Buffered Amplifiers

ABSTRACT

Two simple topologies for the simulation of floating lossy inductances are presented, which realize series and parallel RL impedances employing two voltage differencing buffered amplifiers (VDBAs) as active components. Each of the proposed circuit topologies consists of one resistor and one capacitor, which employs canonical passive components. The equivalent values of the simulated resistance and inductance can be tuned electronically by means of the external biasing currents of the VDBAs. Non-ideal gain effects of the VDBA on the proposed circuits are carried out. The performance of the proposed floating inductors is demonstrated on both a standard second-order RLC low-pass filter and a parallel resonant circuit. Laboratory experiments using commercially available ICs are included to verify the workability of the circuits. Several computer simulations with PSPICE program are also drawn together with theoretical ones for circuit performance verification.

KEYWORDS:

• Analogue filter
• Electronically tunable circuit
• Floating inductance simulator
• Lossy inductor
• Voltage differencing buffered amplifier (VDBA)

ACKNOWLEDGEMENTS

This work was supported by King Mongkut's Institute of Technology Ladkrabang Research Fund [grant number KREF116001]. The author gratefully acknowledges the constructive comments and suggestions of all the anonymous reviewers, which have been very useful in the preparation of the revised version of the manuscript.

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by King Mongkut's Institute of Technology Ladkrabang Research Fund [grant number KREF116001].

Notes on contributors

Worapong Tangsrirat

Worapong Tangsrirat was born in Uthaithani, Thailand, in 1968. He received the B.Ind.Tech. degree (Honours) in Electronics Engineering, and M.Eng. and D.Eng. degrees in Electrical Engineering from Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang (KMITL), Bangkok, Thailand, in 1991, 1997, and 2003, respectively. Since 1995, he has been a faculty member at KMITL, where he is currently a full professor in the Department of Instrumentation and Control Engineering. His research interests are mainly in analogue signal processing and integrated circuits, current-mode circuits, and active filter and oscillator design.

E-mail: [email protected]