High input impedance voltage-mode universal filter using OTAs and grounded capacitors

This paper presents a new high input impedance electronically tunable voltage-mode biquadratic filter with single input and multiple outputs using six single-ended operational transconductance amplifiers and two grounded capacitors. The proposed filter provides low-pass, band-pass and high-pass voltage responses at a high input impedance terminal, which enables easy cascadability of the voltage circuit. The parameters ω_o and Q can also be set orthogonally by adjusting the circuit components. No critical matching condition and no inverting-type input signal are required for the realizing of all the filter responses and all the active and passive sensitivities are low. A non-ideal analysis of the circuit is carried out and the simulation results verifying the performances of the proposed circuit are also included.