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Author: search.filters.author.Lamun, PanitSubject: search.filters.subject.current-mode circuit

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    CFTA-based electroniccally tunable quadrature sinusoidal oscillator
    (2014-10-15)
    Kumngern, Montree
    ;
    Lamun, Panit
    ;
    Junnapiya, Somyot
    This paper presents a new electronically tunable current-mode quadrature sinusoidal oscillator. The proposed oscillator employs only two current follower transconductance amplifiers, one virtually grounded resistor and two grounded capacitors which is advantageous for integrated circuit implementation. The proposed circuit offers the advantages of orthogonal electronic setting for the frequency of oscillation and condition of oscillation, availability of two explicit quadrature current outputs and low sensitivity properties. The outputs of the circuit possess high impedance level which is directly connected to the loads without buffer circuits. PSPICE simulation and experimental results are used to verify the workability of the proposed circuit.
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    Current-mode third-order quadrature oscillator using VDTAs and grounded capacitors
    (2014-01-01)
    Phatsornsiri, Punnavich
    ;
    Lamun, Panit
    ;
    Kumngern, Montree
    ;
    Torteanchai, Usa
    This paper presents a novel electronically tunable current-mode third-order quadrature oscillator based on voltage differencing transconductance amplifier (VDTA). The proposed oscillator is constructed using two VDTAs and three grounded capacitors, which is advantageous for integrated circuit implementation. The circuit provides two current outputs with 90° phase difference from high output impedance terminals. The condition of oscillation and the frequency of oscillation can be electronically tuned by adjusting the bias current of the VDTAs. The sensitivity studies of the circuit have been carried out. PSPICE simulations with 0.35 μm TSMC CMOS process parameters are given to confirm the theoretical analysis. © 2014 IEEE.
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    Tunable current-mode quadrature sinusoidal oscillator using CCCFTAs and grounded capacitors
    (2013-05-20)
    Lamun, Panit
    ;
    Kumngern, Montree
    ;
    Torteanchai, Usa
    ;
    Sarsitthithum, Kanok
    This paper presents a new electronically tunable current-mode quadrature sinusoidal oscillator which employs only two current-controlled current follower transconductance amplifiers (CCCFTAs) and two grounded capacitors. The proposed oscillator offers the advantages of independent electronic control for setting the frequency of oscillation and the condition of oscillation, availability of two explicit quadrature current outputs, and low active and passive sensitivities. The outputs of the circuit possess high impedance level which is directly connected to the loads without buffer circuits. The use of grounded capacitors makes the proposed structure highly suitable for integrated circuit implementation. The workability of the proposed structure is verified by PSPICE simulations based on CMOS technology. © 2013 IEEE.