AN EXAMPLE OF EASY SYNTHESIS OF ACTIVE FILTER AND OSCILLATOR USING SIGNAL FLOW GRAPH MODIFICATION AND CONTROLLABLE CURRENT CONVEYORS

Roman Šotner – Zdeněk Hruboš – Břetislav Ševčík – Josef Slezák – Jiří Petržela – Tomáš Dostál

   The paper deals with synthesis of active frequency filters and oscillators for applications in the video band. The synthesis is based on the modified signal flow graph design approach in the current mode. The commercially available high frequency current conveyors and second order structures are used. Basic structure is employing loss-less and lossy current mode integrators in two distributed feedback loops. Some of the used active elements allow to use controlling of transfer current gain which is very useful in some cases. High frequency filter and quadrature oscillator configurations are discussed. Most of the used passive elements (mainly capacitors) are grounded what is suitable for IC implementation. Simulation and experimental results demonstrate function and features very well.

Keywords: multi level inverter, selective harmonic elimination, genetic algorithm, total harmonic

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