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Experimental Verification of Fractional-Order Filters Using a Reconfigurable Fractional-Order Impedance Emulator

Ilias Dimeas

Physics Department, Electronics Laboratory, University of Patras, Rio Patras, GR-26504, Greece

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Georgia Tsirimokou

Physics Department, Electronics Laboratory, University of Patras, Rio Patras, GR-26504, Greece

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Costas Psychalinos

Physics Department, Electronics Laboratory, University of Patras, Rio Patras, GR-26504, Greece

E-mail Address: cpsychal@physics.upatras.gr

Corresponding author.

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, and

Ahmed S. Elwakil

Department of Electrical and Computer Engineering, University of Sharjah, Sharjah, PO Box 27272, Emirates

E-mail Address: elwakil@ieee.org

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https://doi.org/10.1142/S0218126617501420Cited by:24 (Source: Crossref)

Abstract

Fractional-order filter design examples, realized through the substitution of fractional-order capacitors and inductors by a re-configurable active emulator, are presented in this paper. The implementation of the emulator is achieved using Current Feedback Operational Amplifiers (CFOAs) as active elements with the required fractional-order differentiation/integration performed through the employment of an integer-order multi-feedback topology. An important benefit, from the design flexibility point of view, is that the same topology could be re-configured for emulating both fractional-order capacitors and inductors through the appropriate selection of the time-constants and gain factors. The behavior of the realized filters is experimentally evaluated using commercially available CFOAs.

This paper was recommended by Regional Editor Piero Malcovati.

Keywords:

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