A new voltage mode quadrature oscillator using grounded capacitors: An application of CDBA

Abstract

The paper realizes a single-resistance-controlled oscillator employing current differencing buffered amplifiers as active devices, and virtually grounded resistors and grounded capacitors as passive components. Operating in voltage mode, the designed circuit is capable of generating quadrature outputs along with an unambiguous control of oscillating frequency and condition of oscillation. Initially, practicality and feasibility of the design has been justified by the results obtained using PSPICE simulation software. Simulation results include time response and frequency response outputs generated by using the commercially available I.C. of CFOA, i.e. AD844, as well as by using the CMOS structure of active device employed. Later, hardware experimentation of the design has been included, for which AD844 along with standard components have been employed. Validating results have been obtained in both the cases.

Keywords

• Single-resistance-controlled oscillator
• Quadrature outputs
• Current differencing buffered amplifiers
• Voltage mode oscillators