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

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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.01/2010; -
##### Conference Paper: High-input impedance voltage-mode universal filter using CCCCTAs

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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 -
##### Conference Paper: Novel current-mode quadrature oscillators with explicit-current-outputs using CCCDTA

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**ABSTRACT:**The paper presents novel current-mode (CM) quadrature oscillators (QOs) created using the recently proposed active building block (ABB), namely the current controlled current differencing transconductance amplifier (CCCDTA). Two circuits have been proposed and both of them employ minimum components, namely one multiple output CCCDTA (MO-CCCDTA) and two grounded capacitors. One of the proposed circuits is suitable to be used as a very low frequency oscillator (VLFO) and the other circuit provides non-interactive CO and FO control and could be used as a variable frequency oscillator (VFO). Both the circuits provide explicit quadrature current outputs. Non-ideal analysis, sensitivity study are provided and PSPICE simulations have been included which verify the workability of the circuit.Radioelektronika, 2009. RADIOELEKTRONIKA '09. 19th International Conference; 05/2009

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