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Tunable current-mode quadrature oscillator using CFTAs and grounded capacitors

TitleTunable current-mode quadrature oscillator using CFTAs and grounded capacitors
Publication TypeConference Proceedings
Year of Publication2558
Authorsปัณณวิชญ์ ภัทร์สรณ์สิริ
Conference Name2015 12th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON)
Date Published20 August 2015
Conference LocationHua Hin, Thailand
ISBN Number978-1-4799-7961-5
KeywordsCapacitors, Integrated circuit modeling, Oscillators, Sensitivity, Simulation, Transconductance, Transistors

In this paper, an electronically tunable current-mode quadrature oscillator employing three current follower trans-conductance amplifiers (CFTAs) and two grounded capacitors is proposed. The use of all grounded capacitors makes the proposed circuit ideal for integrated circuit implementation. The circuit provides two high-output impedance current signals with 90° phase difference. It condition of oscillation (CO) and frequency of oscillation (FO) can be adjusted independently and electronically. The active and passive sensitivities of the proposed configuration are low. PSPICE simulation results using TSMC 0.25 μm CMOS process parameters are given to prove the theory.