On practical construction of electronically controllable compact current amplifier based on commercially available elements and its application |
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| Affiliation: | 1. Department of Radio Electronics, Faculty of Electrical Engineering and Communication, Brno University of Technology, Technicka 3082/12, 61600 Brno, Czech Republic;2. Department of Telecommunications, Faculty of Electrical Engineering and Communication, Brno University of Technology, Technicka 3082/12, 61600 Brno, Czech Republic;1. Dogus University, Electronics & Communications Engineering Department, Acibadem, Kadikoy 34722, Istanbul, Turkey;2. University of Patras, Physics Department, Electronics Laboratory, GR-26504 Rio Patras, Greece;1. Department of Electrical and Electronics Engineering, Iran University of Science and Technology (IUST), Tehran, Iran;1. Department of Industrial and Information Engineering and Economics, University of L’Aquila, Località Campo di Pile, via Gronchi 18, L’Aquila 67100, Italy;2. Information Engineering, Electronics and Telecommunications (DIET), Sapienza University, Via Eudossiana 18, Rome 00184, Italy;1. Department of Telecommunications Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand;2. Department of Engineering Education, Faculty of Industrial Education and Technology, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand;3. Department of Microelectronics, Brno University of Technology, Technická 10, Brno, Czech Republic;4. Faculty of Biomedical Engineering, Czech Technical University in Prague, nám. Sítná 3105, Kladno, Czech Republic |
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| Abstract: | This paper presents a new concept of a current amplifier (CA) with electronically adjustable features (input resistance and current gain) implemented using commercially available devices. Several variations of basic structure are studied, described and the selected solutions verified by PSpice simulations and, moreover, also by lab experiments. Saving one discrete active device in comparison to already known similar topologies of single-input and single-output version (CA-SISO) is significant benefit whereas all other qualitative features remain very similar to previously reported ones. Simple modification of CA concept to multiple-output version (CA-SIMO), having independent adjustable current gain in each of output branches, is easily available. Experimental tests of features of discussed concepts yield adjustability range of input resistance from 100 Ω to more than 10 kΩ and current gain adjusting from 0.1 to 3.5 with bandwidth (−3 dB) of CA transfer response up to 16 MHz. As an example of application, proposed CA was successfully implemented in quadrature oscillator with a very wide tunability range from 29 kHz to 4.94 MHz. It was achieved by electronic control of several adjustable parameters of proposed CA. |
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| Keywords: | Adjustable current gain Adjustable resistance of current input terminal Current amplifier Quadrature oscillators Tunability range extension |
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