Title :
Tunable current-mode quadrature oscillator using CFTAs and grounded capacitors
Author :
Phatsornsiri, Punnavich ; Lamun, Panit
Author_Institution :
Dept. of Mechatron. Eng., Pathumwan Inst. of Technol., Bangkok, Thailand
Abstract :
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.
Keywords :
CMOS integrated circuits; SPICE; capacitors; circuit tuning; current-mode circuits; oscillators; CFTA; PSPICE simulation results; TSMC CMOS process parameters; active sensitivities; current follower trans-conductance amplifiers; electronically tunable current-mode quadrature oscillator; grounded capacitors; high-output impedance current signals; integrated circuit implementation; passive sensitivities; size 0.25 mum; Capacitors; Integrated circuit modeling; Oscillators; Sensitivity; Simulation; Transconductance; Transistors; Current Follower Transconductance Amplifier (CFTA); Current-mode circuit; quadrature oscillator;
Conference_Titel :
Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), 2015 12th International Conference on
Conference_Location :
Hua Hin
DOI :
10.1109/ECTICon.2015.7207104
