Current-mode third-order quadrature oscillator using minimum elements

This paper presents a new current-mode third-order quadrature oscillator. The proposed circuit, which uses one current-controlled current differencing transconductance amplifier (CCCDTA), one operational transconductance amplifier (OTA) and three grounded capacitors, can generate two quadrature voltage outputs and two quadrature current outputs. The oscillation condition and the oscillation frequency can be controlled orthogonally and electronically by adjusting the bias currents of the CCCDTA and OTA. The use of only grounded capacitor makes the proposed circuit ideal for integrated circuit implementation. Simulation results verifying the theoretical analysis are also included.