A multifunction filter configuration based on CFA

A new multifunction filter configuration using two CFAs and six impedances is presented in this paper. The proposed circuit can realize the different function using the different impedances. The natural frequency ω0 and quality factor Q can be orthogonal controlled, and the quality factor Q can also be independently controlled by the impedance. Both the active and passive sensitivities are no more than unity. At the end, the theoretical analysis is verified using PIPICE simulations of the filter designs.