CFTA-based electroniccally tunable quadrature sinusoidal oscillator

Abstract

This paper presents a new electronically tunable current-mode quadrature sinusoidal oscillator. The proposed oscillator employs only two current follower transconductance amplifiers, one virtually grounded resistor and two grounded capacitors which is advantageous for integrated circuit implementation. The proposed circuit offers the advantages of orthogonal electronic setting for the frequency of oscillation and condition of oscillation, availability of two explicit quadrature current outputs and low sensitivity properties. The outputs of the circuit possess high impedance level which is directly connected to the loads without buffer circuits. PSPICE simulation and experimental results are used to verify the workability of the proposed circuit.