Author(s)

Tada Comedang^1*, Pattana Intani²

¹Department of Electrical Engineering, Pathumwan Institute of Technology, Bangkok, Thailand.
²Electric and Energy Research (EER), Pathumwan Institute of Technology, Bangkok, Thailand.

This paper presents a study of fractional order quadrature oscillators based on current-controlled current follower transconductance amplifiers (CCCFTA). The design realisation and performance of the fractional order quadrature oscillators have been presented. The quadrature oscillators are constructed using three fractional capacitors of orders α = 0.5. The fractional capacitor is not available on the market or in the PSPICE program. Fortunately, the fractional capacitor can be realised by using the approximate method for the RC ladder network approximation. The oscillation frequency and oscillation condition can be electronically/orthogonally controlled via input bias currents. Due to high-output impedances, the proposed circuit enables easy cascading in current-mode (CM). The PSPICE simulation results are depicted, and the given results agree well with the anticipated theoretical outcomes.

Fractional Order, Quadrature Oscillator, Current-Controlled Current Follower Transconductance Amplifier

Comedang, T. and Intani, P. (2016) Current-Controlled CFTA Based Fractional Order Quadrature Oscillators. Circuits and Systems, 7, 4201-4212. doi: 10.4236/cs.2016.713345.