Suwanjan, Peerawut

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Suwanjan, Peerawut
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Email
peerawut.su@kmitl.ac.th

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    Item type:Publication,
    Single VDDDA-Based Lossy Inductance Simulator for Application to Sinusoidal Oscillator
    (2023-01-01)
    Jaikla, Winai
    ;
    Siripongdee, Surapong
    ;
    Sotner, Roman
    ;
    Suwanjan, Peerawut
    This work presents the design of a new grounded lossy inductance simulator. The proposed circuit emulates an inductor in parallel with a negative resistor, making it applicable to the design of a sinusoidal oscillator. The proposed simulator comprises a voltage differencing differential difference amplifier (VDDDA), a resistor, and a grounded capacitor. The proposed active inductor necessitates no essential matching criteria for passive elements. The equivalent inductance and negative resistance can be controlled electronically. Moreover, the parallel RLC and negative resistance configuration-based sinusoidal oscillator is designed as an example of its application. The oscillation frequency and condition are adjusted orthogonally. The performance of the proposed simulator circuit and the sinusoidal oscillator is evaluated using Pspice simulation and experimentation with VDDDA built from ICs AD830 and LM13700. The simulation and experimental results validate the behavior of the theory.
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    Item type:Publication,
    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.