CCII+ based first order allpass filters with all grounded passive elements

In this study current conveyor based first order allpass filters with all grounded passive components are systematically generated and a set of different topologies are presented which realize the same transfer function. The presented topologies employ two capacitors. The performance of the presented topologies are tested on a circuit example by SPICE simulations. An application example of oscillator realization is given to demonstrate the design possibilities using the proposed CCII+ based first order allpass filters.