This article presents a 3 rd order current-mode quadrature oscillator using current controlled current conveyor transconductance amplifiers (CCCCTAs) as active elements. The proposed circuit is realized from a non-inverting lossless integrator and an inverting second-order lowpass filter. The oscillation condition and oscillation frequency can be electronically/orthogonally controlled via input bias currents. The circuit description is very simple, consisting of merely 2 CCCCTAs and 2 grounded capacitors. Without any external resistors and using only grounded elements, the proposed circuit is then suitable for IC architecture. Due to high-output impedances, the proposed circuit is enable easy cascading in current-mode. The PSPICE simulation results are depicted, and the given results agree well with the theoretical anticipation. The power consumption is approximately 2.43mW at ±3V supply voltages.
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.
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