Authors : Alexander C. Abad, Geoffrey L. Abulencia, Roderick Yap and Emmanuel A. Gonzalez
Abstract: This study focused on the design and implementation of a four selectable Fractional-Order (0.2, 0.4, 0.6 and 0.8) Differentiator (FOD) in a 0.35 μm CMOS technology operated at 1.5 V supply. In comparison with previous research that use discrete components and generic microcontroller to switch an FOD from one order to the next, this design of a selectable FOD was realized in an analog microelectronics scale. The dimension of the Integrated Circuit (IC) layout was further reduced by employing reusability of capacitors and resistors. The whole chip layout of the design, excluding input/output pads has a dimension of 8.10×6.30 mm or equivalent to a final area of 51.03 mm2. The four possible orders of an FOD were characterized in terms of its magnitude and phase response in the working bandwidth from 10-1 kHz. Characterization was made using SPICE simulation tool and IC layout editor software.
Alexander C. Abad, Geoffrey L. Abulencia, Roderick Yap and Emmanuel A. Gonzalez, 2018. Design and Implementation of a Low-Voltage Four Selectable Fractional-Order Differentiator in a 0.35 μm CMOS Technology. Journal of Engineering and Applied Sciences, 13: 1479-1486.