Current-Mode High Output Impedance Multifunction Filters Employing Minimum Number of FTFNs

  • Authors:

  • Uğur Çam;Oğuzhan Çiçekoğlu;Ali Toker;Hakan Kuntman

  • Affiliations:

  • Sakarya University, Department of Electrical and Electronics Engineering, Engineering Faculty, 54040 Esentepe, Adapazari, Turkey;Boğaziçi University, Institute of Biomedical Engineering, 80815, Bebek, Istanbul, Turkey;Istanbul Technical University, Faculty of Electrical and Electronics Engineering, Department of Electronics and Communication Engineering, 80626 Maslak, Istanbul, Turkey;Istanbul Technical University, Faculty of Electrical and Electronics Engineering, Department of Electronics and Communication Engineering, 80626 Maslak, Istanbul, Turkey

  • Venue:
  • Analog Integrated Circuits and Signal Processing
  • Year:
  • 2001

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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, \omega_0, Q and \omega_0/Q of the filters are insensitive to current tracking errors, furthermore \omega_0 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 \omega_0 without disturbing \omega_0/Q. Experimental and simulation results are given to verify the theoretical analyses.