Single UCC-N1B 0520 device as a modified CFOA and its application to voltage- and current-mode universal filters

In this paper new voltage- and current-mode universal frequency filter topologies employing single modified current-feedback operational amplifier (MCFOA) as active element and five passive elements are presented. The proposed filter structures enable realizing all standard filter functions (low-, band-, high-pass, band-stop, and all-pass filter responses). Moreover, the independent adjustment of the quality factor Q by varying the value of single passive element without effecting of the natural frequency omega₀ is possible. All the passive and active sensitivities are low. In the PSPICE simulations the MCFOA using the real model of the UCC-N1B 0520 device are used to verify the theoretical conclusions of the proposed circuits.