Tunable OTA Low Pass Filter with the Fractional-Order step Technique

⎯ This paper presents the tunable technique of the analog filter at high frequency fp = 1 MHz by used the Fractional-order ( ) n α + step, where n is an original of integerorder on circuit and α is an approximation order step 0 1 α < < , An approximation order is designed from the Fractance circuits, and also presents the approximation function of the Fractional-order Laplacian sα design on the OTA lowpass filter circuit. This circuit used single active component. OTA and CFA components are in monolithic chip (IC LT1228).The CFA design with the Fractional-order elements to feedback control the OTA for relative stabilty gain of amplifier. The results shown that tunable filter by Fractional-order step technique provides the flat passband and reduced the peaking problem and improved slope of magnitude response of filter and result comparable with high-order filters. Keywords− Operation Transconductance; Fractional-order; Low Pass filter; Fractance circuits