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Comparison of Two Solutions of Quadrature Oscillators With Linear Control of Frequency of Oscillation Employing Modern Commercially Available Devices

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Abstract

This paper proposes two circuits of frequency-controlled oscillators, whose structures are based only on simple commercially available active elements with minimum number of terminals, in particular, the differential voltage buffer, controllable voltage amplifier and electronically controllable current conveyor. Two methods for achieving linear control (tuning) of frequency of oscillations (FO) are discussed. The first method employs a simple structure. However, the generated signal level (amplitude) depends on the tuning process. This is a drawback of this method. The second method solves this drawback completely, and the generated signals have constant amplitudes during the tuning of FO. The expected behavior is confirmed by laboratory experiments utilizing commercially available high-speed active elements (current- and voltage-mode multipliers, video difference amplifier). Operational range was tested from frequencies of hundreds of kHz up to frequencies of tens of MHz.

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Acknowledgments

Research described in this paper was financed by Czech Ministry of Education in frame of National Sustainability Program under Grant LO1401. For research, infrastructure of the SIX Center was used. Research described in the paper was supported by Czech Science Foundation project under No. 14-24186P. Grant No. FEKT-S-14-2281 also supported this research. The support of the Project CZ.1.07/2.3.00/20.0007 WICOMT, financed from the operational program Education for competitiveness, is gratefully acknowledged. The authors would like to thank the editor and the anonymous reviewers for their useful and constructive comments that helped to improve the paper.

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Authors and Affiliations

  1. Department of Radio Electronics, Faculty of Electrical Engineering and Communication, Brno University of Technology (BUT), Technicka 3082/12, 616 00, Brno, Czech Republic

    Roman Sotner & Jiri Petrzela

  2. Department of Telecommunications, Faculty of Electrical Engineering and Communication, Brno University of Technology (BUT), Technicka 3082/12, 616 00, Brno, Czech Republic

    Jan Jerabek, Lukas Langhammer, Josef Polak & Norbert Herencsar

  3. Department of Microelectronics, Faculty of Electrical Engineering and Communication, Brno University of Technology (BUT), Technicka 3058/10, 616 00, Brno, Czech Republic

    Roman Prokop

  4. Department of Engineering Education, Faculty of Industrial Education, King Mongkut’s Institute of Technology Ladkrabang, Ladkrabang, Bangkok, 105 20, Thailand

    Winai Jaikla

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  1. Roman Sotner
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Correspondence to Roman Sotner.

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Sotner, R., Jerabek, J., Langhammer, L. et al. Comparison of Two Solutions of Quadrature Oscillators With Linear Control of Frequency of Oscillation Employing Modern Commercially Available Devices. Circuits Syst Signal Process 34, 3449–3469 (2015). https://doi.org/10.1007/s00034-015-0015-7

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