Electronically tunable versatile voltage-mode biquadratic filter with three-input six-output using OTAs and grounded capacitors

This paper presents a new electronically tunable versatile voltage-mode biquadratic filter with three inputs and six outputs using operational transconductance amplifiers and grounded capacitors. The proposed circuit provides simultaneously realize voltage-mode low-pass, band-pass, high-pass, band-stop and allpass filter responses. The natural frequency and the quality factor can be set orthogonally. Also the natural frequency can be electronically controlled. No component-matching conditions and no inverting-type input signals are required for realizing all the filter responses. The active and passive sensitivities are low. PSPICE simulation results are given to confirm the presented theory.