Design and improve the performance of OTA low pass filter with Fractional-order step

This article presents a circuit design to improve the performance of analog filter at high frequency fp = 1 MHz by used the Fractional-order (n + α) step, where n is an original of integer-order in circuit and α is an approximation order step 0 <; α <; 1, The approximation order is designed from the Fractance circuit.This article also presents the approximation function of the Fractional-order Laplacian s^α which is designed on the OTA low pass filter circuit. This circuit used single active component. OTA and CFA components are in monolithic chip (IC LT1228). The CFA is designed to work with the Fractional-order elements to feedback control the OTA for relative stability gain of amplifier. The results shown that the improvement by Fractional-order step provides the sustainability of flat passband, reduced the peaking at the cut-off frequency, improved slope of magnitude response of filter and result comparable with high-order filters.