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Subject: search.filters.subject.Oscillator

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Now showing 1 - 8 of 8
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    Simple realization of quadrature sinusoidal oscillator with independent control
    (2017-07-02)
    Chaichana, Amornchai
    ;
    Jaikla, Winai
    In this paper, a new sinusoidal oscillator is proposed. As a interesting feature, the proposed oscillator provides two sinusoidal voltage waveforms with 90° degree phase difference without the requirement of additional phase shifter circuit. The proposed circuit employs only a voltage differencing current conveyor (VDCC), three resistors and two grounded capacitors. The frequency of oscillation (FO) and condition of oscillation (CO) can be independently controlled. Also, the tuning of frequency of oscillation can be done electronically. The use of single active is highly attractive from integration point of view. PSPICE simulations using 0.18μm CMOS parameters and supply voltage of ±0.9V demonstrates a precise operation.
      3
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    Electronically controllable grounded inductance simulators using single commercially available IC: LT1228
    (2017-06-01)
    Siripongdee, Surapong
    ;
    Jaikla, Winai
    The grounded inductance simulators using available commercially integrated circuit (IC) are proposed in this paper. The three types of active inductor called parallel R and L, series R and L and pure L are achieved. The proposed inductance simulators consist of single available commercially IC from Linear Technology Inc. called LT1228 with a resistor and a capacitor. The tune of inductance and resistance value can be done electronically. The proposed inductance simulators don't require any active and passive component matching condition. The performances of proposed circuit are verified through PSPICE simulation and experiment. To show the usability of the proposed simulators, they are used to realize the sinusoidal oscillator, second order bandpass filter and second order band-reject filter. The workability of these applications is experimented. The results agree well with theoretical expect.
      1
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    High input impedance voltage-mode universal filter and its modification as quadrature oscillator using VDDDAs
    (2017-05-01)
    Tuntrakool, Sunti
    ;
    Kumngern, Montree
    ;
    Sotner, Roman
    ;
    Herencsar, Norbert
    ;
    Suwanjan, Peerawut
    The second order universal voltage-mode filter using voltage differencing differential difference amplifiers (VDDDAs) has been proposed. It has high input impedance voltage-mode biquad filter with orthogonal tune of natural frequency and quality factor. The proposed filter simultaneously provides five filter responses: low-pass (LP), high-pass (HP), band-reject (BR), all-pass (AP) and band-pass (BP) in the same circuit topology. The natural frequency and quality factor can be tuned electronically and orthogonally dc bias current. The output impedance at output nodes HP, AP and BR has low impedance which can connect to other circuit without the use of voltage buffers. The proposed filter consists of three VDDDAs, one grounded resistor and two grounded capacitors. This makes the proposed filter suitable for integrated circuit development. With slightly modifying the proposed filter, the voltage-mode qudrature sinusoidal oscillator with low output impedance and independent control of condition of oscillation (CO) and frequency of oscillation (FO) has been achieved. The results shown in this paper are from PSPICE simulation and experiment to validate the proposed circuits.
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    Novel oscillator based on voltage and current Gain adjusting used for control of oscillation frequency and oscillation condition
    (2013-06-28)
    Sotner, R.
    ;
    Jerabek, J.
    ;
    Jaikla, W.
    ;
    Herencsar, N.
    ;
    Vrba, K.
    The paper deals with novel controllable oscillator where two types of electronic control are used. Proposed second-order circuit contains current follower, adjustable current amplifier, adjustable voltage amplifier, two resistors and two grounded capacitors. Oscillation frequency is tuned by voltage gain of used voltage amplifier that is represented by high-frequency voltage-mode multiplier. Oscillation condition is automatically regulated by current gain of the adjustable current amplifier which is based on current-mode multiplier. Experimental results confirmed workability of the circuit.
      1
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    Current-mode quadrature oscillator based on CCCDTAs with noninteractive dual-current control for both condition of oscillation and frequency of oscillation
    (2013-04-22)
    Jantakun, Adirek
    ;
    Jaikla, Winai
    The realization of 2 current-mode quadrature oscillators using current-controlled current differencing transconductance amplifiers (CCCDTAs) and grounded capacitors is presented. The proposed oscillators can provide 2 sinusoidal output currents with a 90° phase difference. They enable noninteractive dual-current control for both the condition of oscillation and the frequency of oscillation. The high-output impedances of the configurations enable the circuit to be cascaded without additional current buffers. The use of only grounded capacitors is ideal for integration. The circuit performances are depicted through PSpice simulations; they show good agreement to theoretical. © Tübi·tak.
      1
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    Current-mode sinusoidal quadrature oscillator with independent control of oscillation frequency and condition using CDTAs
    (2010-05-01)
    Tangsrirat, Worapong
    ;
    Tanjaroen, Wason
    A current-tunable current-mode sinusoidal quadrature oscillator, constructed from only three current differencing transconductance amplifiers (CDTAs) and two grounded capacitors with the absence of the passive resistors, is presented and analyzed. The proposed oscillator provides the important advantage of non-interactive electronic control of the oscillation condition and the oscillation frequency (ω<inf>0</inf>) and is capable of generating two quadrature current outputs. The circuit exhibits low active and passive sensitivities and is suitable for integration. Theoretical results are verified with PSPICE simulations.
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    Active notch uniformly distributed RC circuit and their application
    (2008-12-01)
    Tangthong, Nipont
    ;
    Pirajnanchai, Virote
    ;
    Janchitrapongvej, Kanok
    Many application of the RC parallel-T network, only two performance characteristics are considered important the frequency and depth of the attenuation notch. In this paper the design presented, active notch distributed RC network (URC̄) circuit from design values. The proposed circuit configuration consists of URC̄, one external resistor (Rn) or capacitor (Cn) and single gain amplifier. The parameters of the proposed circuit can be adjusted to improve the magnitude response with notch tunable frequency. This structure reduces an amount of circuit complexity and is simple to use for application. The experiments and computer simulation showed good agreement with theoretical values. The active notch URC̄ can application to experiments high frequency active band-pass filter, sinusoidal wave oscillator and frequency discriminator.
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    Current-conveyor-based single-element-controlled and current-controlled sinusoidal oscillators
    (2006-07-01)
    Fongsamut, C.
    ;
    Anuntahirunrat, K.
    ;
    Kumwachara, K.
    ;
    Surakampontorn, W.
    A new single-element-controlled sinusoidal oscillator circuit that incorporates two second generation current conveyors (CCIIs), two grounded capacitors and two resistors is presented and analysed. The circuit is beneficial to monolithic integrated circuit implementation by the use of grounded capacitors. In addition, a new current-controlled sinusoidal oscillator using only two second generation current controlled conveyors (CCCIIs) and two grounded capacitors can be achieved by replacing CCIIs and resistors series at X terminals with CCCIIs. The oscillators provide extremely low passive 0 -sensitivities and good frequency stability. Moreover, the oscillation frequencies of the CCII-based and the CCCII-based oscillators can be controlled, respectively, by a grounded resistor and by an external bias current. Experimental and SPICE simulation results that confirm the theoretical predictions are given.