Realization of SIMO biquad filters and quadrature sinusoidal oscillators using OTRAs

Abstract

In this communication, two single-input multiple-output (SIMO) type biquad filters employing operational trans resistance amplifiers (OTRAs) have been presented. Various parameters of the proposed filter circuits viz. pole frequency (ɷ), pole quality factor (Q), and the gain are independently controllable. The proposed filter configurations can also be converted into low-frequency oscillators with fully uncoupled control of the condition of oscillation and frequency of oscillation with quadrature output voltages. The active and passive sensitivities of the proposed circuits have been found to be small. SPICE simulation results and experimental validation of the proposed circuits employing OTRAs realized with AD844 type CFOAs have also been presented.