Pseudo-Differential (2 + α)-Order Butterworth Frequency Filter

This paper describes the design of analog pseudo-differential fractional frequency filter with order $(2+\alpha)$ , where notation="LaTeX">$0 < \alpha 1$ . The operates in a mixed-transadmittance mode (voltage input, current output) and provides low-pass response according to Butterworth approximation. General formulas determine required transfer function coefficients for desired value notation="LaTeX">$\alpha $ are also introduced. designed beneficial features fully-differential solutions but less complex circuit topology. It is canonical, i.e. it employs minimum number passive elements, whereas all grounded, conveyors as active elements. proposed structure offers high input impedance, output common-mode rejection ratio. By simple modification, voltage can be obtained. performance verified both by simulations experimental measurements proving validity theory advantageous filter.