Aplikace proudových konvejorů v elektronických obvodech

Abstract

Main intention and idea of doctoral thesis is to introduce current conveyors as the modern active elements available for realization of wide spectrum of electronic circuits. Despite quite long history of current conveyors, they are not used more in real applications. Therefore main intention of this doctoral thesis is theoretically and practically to prove that current conveyors can be considered as the universal elements. In the initial part of thesis is described brief history of current conveyors development and theirs basic functionality principle. Furthermore there are described also CDBA elements which demonstrate duality principle and through this theory it is possible continuously to introduce also voltage conveyors, which it is also necessary to mention related to current conveyors. Theoretical part also offers description of general variants of conveyors which are suitable for proposals of theoretical applications, further description of universal conveyors suitable for practical applications. Theoretical part also covers examples of possible practical implementation of current conveyors but it is limited only to variants CCII+ and CCII-. Practical part of thesis is represented by chapters describing proposals of synthetic elements of higher orders and theirs implementation in frequency filters structures. This method uses admittance network when current conveyor is used again as a key active element. In this case it is possible to prove functionality of applications only by simulations because these circuits use commercially unavailable variants of current conveyors. Another design method is design of functional block structures with current conveyors where primarily CCII+ elements are applicable and therefore proposed circuits can be practically realized. Frequency filter, amplifiers, oscillator and functional generator were selected as example applications. Proposed circuits work at higher frequencies and benefits of these modern active elements are enforced.