Conference Paper

A novel versatile circuit functioning as both filter and oscillator based on CCCCTAs

Electr. & Ind. Program, Uttaradit Rajabhat Univ., Uttaradit
DOI: 10.1109/APCCAS.2008.4746283 Conference: Circuits and Systems, 2008. APCCAS 2008. IEEE Asia Pacific Conference on
Source: IEEE Xplore

ABSTRACT A circuit which can function both as quadrature oscillator and as a universal biquad filter (low-pass, high-pass, band-pass, band-reject and all-pass functions) is introduced in this paper. Working as quadrature oscillator, the oscillation condition and oscillation frequency can be adjusted independently with the input bias currents. Functioning as a universal biquad filter, the quality factor and natural frequency can be tuned orthogonally via the input bias currents. The proposed circuit can work as either a quadrature oscillator or a universal biquad filter without changing circuit topology. The proposed circuit description is very simple, consisting of merely 2 current controlled current conveyor transconductance amplifiers (CCCCTAs) and 2 grounded capacitors. Without any external resistors and using only grounded elements, this circuit is thus suitable for IC architecture. The PSPICE simulation results are depicted, and the given results agree well with the theoretical anticipation. The maximum power consumption is approximately 3.78 mW at plusmn1.5 V power supplies.

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    ABSTRACT: This article presents a voltage-mode universal biquadratic filter (low-pass, high-pass, band-pass functions), based on current controlled current conveyor transconductance amplifiers (CCCCTAs). The features of the circuit are that: the quality factor and pole frequency can be tuned orthogonally via the input bias currents: the circuit description is very simple, consisting of merely 3 CCCCTAs and 2 grounded capacitors. Without any external resistors, requiring no component matching conditions, and using only grounded elements, the proposed circuit is very appropriate to further develop into an integrated circuit. Moreover, the proposed circuit enables easy cascading in voltage-mode, due to high-input impedances. The PSPICE simulation results are depicted. The given results agree well with the theoretical anticipation. The power consumption is approximately 4.08mW at ±2.5V power supply voltages.
    Electrical Engineering/Electronics Computer Telecommunications and Information Technology (ECTI-CON), 2010 International Conference on; 06/2010
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    ABSTRACT: This article presents a novel current-mode universal biquadratic network providing both standard transfer functions. The principal element of proposed network is CC-CCTAs. The feature of this network is that the pole frequency quality factor can be orthogonally adjusted via input bias currents. Besides performing as a universal filter, with an appropriate condition, the proposed network can function as a quadrature oscillator without changing its circuit topology. The oscillation frequency and oscillation condition can be independently controlled via input bias currents. The PSPICE simulation results are depicted. The given results agree well with the theoretical anticipation, where the maximum power consumption is 6.65mW at ±1.5V supply voltages. In addition, the circuit description is very simple, consisting of merely 3 CC-CCTAs and 2 grounded capacitors. Without any external resistors and using only grounded elements, the proposed circuit is very easy to further develop into an IC form for operating in battery-powered portable wireless communication system equipment.
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    ABSTRACT: This article presents a novel circuit, which can function both a high-output impedance current-mode universal biquad filter and quadrature sinusoidal oscillator for the same topology. The features of the proposed circuit as a universal filter are that the pole frequency and the quality factor can be adjusted independently controlled via input bias current. Besides performing as a universal filter, with an appropriate condition, the proposed circuit can function as a quadrature oscillator without changing its circuit topology. The oscillation frequency and oscillation condition can be independently controlled via input bias currents. In addition, since the proposed circuit comprises only active elements, which are 3 CCCCTAs and 2 operational amplifiers (OAs), it is very suitable to further develop into an integrated circuit. The PSPICE simulation results are depicted.