Tunable elliptic filters using multioutput current controlled conveyors

The circuit topologies are proposed for realizing the continuous time current-mode ladder filter of any order. The derived technique is based on the attractive features of the leapfrog simulation implementing using only multioutput second generation current controlled conveyor (MCCCII) and grounded capacitors that lead to simple structure, easy to design and suitable for IC fabrication. An example of the third-order elliptic low-pass filter which retains a minimum requirement of passive and active elements, as well as, possess the advantage of electronically tunable in cut-off frequency has been introduced. Moreover, this method can also be implemented by adding floating capacitors to the relative all-pole filter. Simulation results are provided to compare against the prototype passive RLC filter.