An active-only high-output impedance current-mode quadrature oscillator using CCCCTA based-lossless differentiators

This article presents a high-output impedance current-mode quadrature sinusoidal oscillator, providing sinusoidal signals, which differ of 90° in phase. The features of the proposed circuit are that; oscillation frequency can be electronically controlled; it can provide the quadrature signal, which is free from the preset of oscillation condition. In addition, since the proposed circuit comprises only active elements, which are 2 CCCCTAs and 2 operational amplifiers, it is very suitable to further develop into an integrated circuit. The PSPICE simulation results are depicted.