A. Toker et al., Supplementary all-pass sections with reduced number of passive elements using a single current conveyor, INT J ELECT, 88(9), 2001, pp. 969-976
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.