A Single Parameter Voltage Adjustable Immittance Topology for Integer- and Fractional-Order Design Using Modular Active CMOS Devices

A simple single parameter adjustable immittance concept designed with modular active devices, fabricated in I3T $25~0.35~\mu \text{m}$ 3.3 V CMOS process of ON Semiconductor, is introduced. The proposed devices employ an integer-order capacitor and specifically fractional-order capacitors (sometimes called constant phase elements). topology consists two elements, namely a linearly voltage operational transconductance amplifier differencing unity gain follower/buffer, only passive i.e. redundancy minimized. offers generation having both the capacitive inductive character. importance order as well value pseudo-capacitance for design analyzes are shown, including all important parasitic features estimation expected bandwidth which have to be considered design. determined by high values approximants capacities (225, 56 $8.8~\mu \text{F}$ /sec^1- $\alpha $ , where represents equal 0.25, 0.5 0.75, respectively). These parameters result into ranges between tens Hz units-tens kHz. adjustability from 70 $700~\mu \text{S}$ driving 0.05 approximately one decade change equivalent capacitance inductance. Laboratory-based experiments done prototype confirmed theoretical presumptions.