This paper studies a new fractional-order form for the active low-pass filter. The form was mainly generated from generalizing an active second-order low-pass filter with three capacitors to the fractional-order domain with three independent orders. The transfer function introduced an extra term in the denominator comprising the third fractional order. The effect of the third fractional-order alongside the other transfer function coefficients on the critical frequencies had been studied numerically. For simulation purposes, Foster I realization had been utilized to synthesis the fractional-order capacitors approximated by using Matsuda technique. The simulation had been carried out on OrCAD showing matching results to the theoretical analysis with subtle error for the half-power frequency. Experimental work had been conducted on ELVIS II kit using off-The-shelf components and the results showed a match to the simulation profile with low error. Aside from that, complete design flow for active fractional-order filters had been followed in this work. © 2019 IEEE.
Hassanein A.M., Soltan A., Said L.A., Madian A.H., Radwan A.G.
active filter; approximation; fractional order; fractional-order capacitor; independent orders; low-pass filter
NILES 2019 – Novel Intelligent and Leading Emerging Sciences Conference, Art. No. 8909312, PP. 218 to 221, Doi: 10.1109/NILES.2019.8909312