Biomedical and biological applications of fractional-order circuits

Fractional-order circuits for emulating the mechanical impedance model of the human respiratory system, as well as the wood tissue impedance model are presented in this work. This has been achieved using active emulators of fractional-order capacitors and inductors. Thanks to the employment of Operational Transconductance Amplifiers, the derived structures are resistorless and, also, their characteristics are electronically controlled through appropriate dc voltages/currents. Therefore, they offer design flexibility and modularity and could be used for emulating various types of tissues and biomedical systems. The performance of the provided designs has been evaluated using the Cadence IC design suite and the Design Kit provided by the Austrian Micro Systems 0.35um CMOS process.