Current-Mode High Output Impedance Multifunction Filters Employing Minimum Number of FTFNs |
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Authors: | Uğur Çam Oğuzhan Çiçekoğlu Ali Toker Hakan Kuntman |
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Affiliation: | (1) Department of Electrical and Electronics Engineering, Engineering Faculty, Sakarya University, 54040 Esentepe, Adapazari, Turkey;(2) Institute of Biomedical Engineering, Bo aziçi University, 80815 Bebek, Istanbul, Turkey;(3) Faculty of Electrical and Electronics Engineering, Department of Electronics and Communication Engineering, Istanbul Technical University, 80626 Maslak, Istanbul, Turkey |
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Abstract: | In this study, five current-mode FTFN-based multifunction filters are proposed, which realize the same transfer functions in ideal case. All circuits employ two capacitors and three resistors. For each circuit R-C:C-R transformation increases the number of realization possibilities to ten. The proposed topologies simultaneously realize three basic filtering functions using minimum number of FTFNs and provide high output impedances that enable easy cascading in current mode. Sensitivity analysis of the filters show that they have low passive sensitivities,
and
of the filters are insensitive to current tracking errors, furthermore
of the filters are insensitive to voltage tracking errors of the FTFNs. The proposed circuits do not require component matching condition except for notch and allpass responses and permit independent adjustment of
without disturbing
. Experimental and simulation results are given to verify the theoretical analyses. |
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Keywords: | four terminal floating nullor current-mode circuits active filters |
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