Design of quadrature oscillator using Current Differencing (CDTA) Transconductance Amplifier

A CDTA (Current Differencing Transconductance Amplifier)-based quadrature oscillator circuit is proposed, employing two CDTAs and two capacitors. All capacitors are grounded. No oscillation condition is needed for the proposed oscillator circuit. The output terminals of the oscillator circuit exhibit high output impedance values, high-end features without any need to a buffer circuit for proper drive of the load. PSPICE simulation results of the proposed circuit using TSMC 0.35µ CMOS process model are included to verify the expected values.