Abstract—This paper presents the current-mode quadrature sinusoidal oscillator employing current controlled current differencing transconductance amplifier (CCCDTA) as active element. The proposed oscillator can provide 2 sinusoidal waveforms with high output impedance which makes the proposed oscillator can directly drive load or cascade in current mode circuit without any current buffers. The condition of oscillation (CO) and frequency of oscillation (FO) can be orthogonally controlled by mean of electronic tuning. The circuit consists of only single CCCDTA and three grounded passive elements which are ideal for implementation on an integrated circuit (IC) chip. The predicted results confirmed with Pspice simulation using BJT technology are agreed with theoretical analysis.

Index Terms—Quadrature oscillator, Integrated circuit, CCCDTA, Current-mode.

The authors are with the Department of Electrical Communication Engineering, Faculty of Industrial Education, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand (e-mail: phakaphon@hotmail.com, kspeeraw@gmail.com, winai.ja@hotmail.com ).