Supplementary all-pass sections with reduced number of passive elements using a single current conveyor

Four new configurations realizing current conveyor-based first-order all-pa ss filters are proposed. Using these configurations two types of first-orde r voltage-mode allpass filter can be realized. The circuits employ a single positive type second-generation current conveyor (CCII+) and only three pa ssive components. For each topology only a simple component matching constr aint is required. To illustrate the design possibilities provided by the in troduced circuits an oscillator circuit consisting of the proposed all-pass filters is constructed and experimentally tested.