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Versatile high input impedance voltage-mode three-inputs universal biquadratic filter

This paper presents a new high input impedance voltage-mode universal biquadratic filter with three inputs and six outputs using three plus-type differential difference current conveyors (DDCCs), two grounded capacitors, and three resistors. The proposed circuit can realize all the standard filter functions (low-pass, high-pass, band-pass, notch, and all-pass). Moreover, the circuit enjoys (i) the employment of two grounded capacitors, (ii) high input impedance and (iii) low active and passive sensitivity performance. HSPICE simulation results confirm the theoretical analysis.