Implementation of Fractional-order Model of Nickel-Cadmium Cell using Current Feedback Operational Amplifiers

This work proposes an integrated-circuit architecture emulating a standard fractional-order model of NickelCadmium cell for computer simulating electrochemical behavior. The architecture is based on fractional-order elements implemented with both active and passive components, offering an accurate transfer function behavior up to 250Hz. It consists of a reduced number of active elements and implements analog allpass filters coupled with a current conveyor. Performance and accuracy of the proposed architecture is confirmed via Monte-Carlo analysis. The proposed circuitry has been designed in TSMC 90nm CMOS process and simulated using the Cadence IC suite.