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This paper introduces the generalization of the classical Transitional Butterworth-Butterworth Filter (TBBF) to the Fractional-Order (FO) domain. Stable rational approximants of the FO-TBBF are optimally realized. Several design examples demonstrate the robustness and modeling efficacy of the proposed method. Practical circuit implementation using the current feedback operational amplifier employed as an active element is presented. Experimental results endorse good agreement (<inline-formula> <tex-math notation="LaTeX">$\text {R}^{2} = 0.999968$ </tex-math></inline-formula>) with the theoretical magnitude-frequency characteristic.

A Fractional-Order Transitional Butterworth-Butterworth Filter and Its Experimental Validation