SITO type voltage-mode biquad filter based on single VDTA

Abstract

A new biquad filter topology realizing three simultaneous voltage-mode filtering responses is reported in the work which employs only single active element in the form of voltage differencing trans-conductance amplifier (VDTA) and three passive elements as two grounded capacitors and one resistor. The realized filtering functions by the filter are lowpass (LP), bandpass (BP), and bandreject (BR). The proposed filter enjoys with reasonable total harmonic distortion, low active/passive sensitivities, and low power consumption. Moreover, the pole frequency can be tuned independent of quality factor by the means of currents. In order to verify the validity of the circuit, the proposed filter is simulated using PSPICE software in 0.18 µm CMOS technology.