Realization of multiport D‐R mutator and its application to high‐pass filters

Abstract

AbstractActive RC circuits using gyrators as active elements can be applied to the realization of inductorless filters which inherit the superior transmission characteristics of LC filters. However, equivalent transmission characteristics can also be obtained by the application of D ‐ R mutators that simulate frequency dependent negative conductance defined as Y = s2D. Gyrators can be constructed from operational amplifiers used as voltage‐current transducers or negative impedance converters. In this paper, a multiport D ‐ R mutator is realized in the way that the capacitance takes the place of the resistance of multiport gyrator, which is constructed by negative impedance converter using current conveyors as voltage‐current transducer. It is shown that a multiport D ‐ R mutator obtained in this way can then be applied to the realization of a high‐order, high‐pass filter; the excellent measurement results are also presented. It is shown that the realized high‐pass filter has few passive elements in comparison with those derived using methods based on operational amplifiers, the filter characteristic can be easily tuned by grounded passive elements, and the proposed active elements are particularly efficient for the realization of high‐order, high‐pass filters.