Current-controlled quadrature oscillator using only CCCDBAs

Abstract

An electronically tunable quadrature oscillator using only two current-controlled current differencing buffered amplifiers (CCCDBAs) and two grounded capacitors without external passive resistor is proposed. The outputs of two sinusoidal waveforms with 90° phase difference are available from the configuration. The oscillation condition and the oscillation frequency (ψo) of the proposed oscillator circuit are tunable by electronically through controlling the external dc bias currents of the CCCDBAs. The simulation results with PSPICE are used to verify the theory.