Electronically Tunable Fully Integrated Fractional-Order Resonator

A fully integrated implementation of a parallel fractional-order resonator that employs together a fractional-order capacitor and a fractional-order inductor is proposed in this brief. The design utilizes current-controlled operational transconductance amplifiers as building blocks, designed, and fabricated in AMS 0.35-mu m CMOS process and based on a second-order approximation of a fractional-order differentiator/integrator magnitude optimized in the range 10 Hz-700 Hz. An attractive benefit of the proposed scheme is its electronic tuning capability.