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Current-mode universal filter and quadrature oscillator using current controlled current follower transconductance amplifiers

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Abstract

This paper presents a new current-mode quadrature oscillator and universal filter that employs two current controlled current follower transconductance amplifiers and two grounded capacitors. The proposed circuit can be realized either as a quadrature oscillator or as a universal filter without changing circuit topology. In case the circuit works as a quadrature oscillator, the condition and the frequency of oscillation can be independently and electronically controlled. Four-phase quadrature current outputs and two-phase quadrature voltage outputs can also be obtained. In case the circuit works as a universal filter, low-pass, high-pass, band-pass, band-stop and all-pass filtering functions can be obtained simultaneously by appropriately selecting the input and output signals. The natural frequency and the quality factor of filter can also be obtained independently and electronically. PSPICE simulation results are used to verify the workability of the new topology.

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Acknowledgments

Research described in this paper was in part financed by the national sustainability program under Grant LO1401. For the research, infrastructure of the SIX center was used.

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Authors and Affiliations

  1. Department of Telecommunications Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand

    Montree Kumngern

  2. Department of Microelectronics, Brno University of Technology, Technická 10, Brno, Czech Republic

    Fabian Khateb

  3. Faculty of Biomedical Engineering, Czech Technical University in Prague, nám. Sítná 3105, Kladno, Czech Republic

    Fabian Khateb

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  1. Montree Kumngern
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Correspondence to Montree Kumngern.

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Kumngern, M., Khateb, F. Current-mode universal filter and quadrature oscillator using current controlled current follower transconductance amplifiers. Analog Integr Circ Sig Process 100, 235–248 (2019). https://doi.org/10.1007/s10470-018-1345-8

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