New explicit-current-output SRCO using a single CFOA and all grounded capacitors

Abstract

A new explicit-current-output (ECO) single-resistance-controlled-oscillator (SRCO) using a single CFOA has been presented which (i) provides independent control of the condition of oscillation and the frequency of oscillation (both through two separate resistors) (ii) employs all grounded capacitors (as preferred for IC implementation) (iii) is suitable for generating very-low-frequency oscillations and (iv) enjoys control of oscillation frequency through a ground resistor (thereby offering suitability for VCO realisation by replacing the resistor by JFET/MOSFET-based voltage-controlled-resistance). The proposed circuit represents a significant development due to the reason that although ECO SRCOs have been reported earlier using two or more CFOAs, to the best of the authors’ knowledge, any circuit using only a single CFOA along with the simultaneous attainment of the above mentioned properties, has not been reported in the literature earlier till date. The workability of the proposed circuit has been verified by experimental results using AD844-type CFOA and some sample results have been included.