Simple Designs of Power-Law Basic and Inverse Filters

The standard power-law filter functions of order less than one, as well as their inverse counterparts, are implemented using only one active element in this work. The corresponding transfer functions are realized as impedances ratio, and the associated non-integer-order impedances are approximated using a suitable approximation technique, for fitting their magnitude and phase frequency responses. The employment of the Current Feedback Operational Amplifier as active element also offers the capability of interconnecting the filter stages without the requirement of extra buffer stages. The behavior of the presented schemes is validated through simulation results, obtained using the OrCAD PSpice simulator.