Supavarasuwat, Piya

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Supavarasuwat, Piya
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piya.su@kmitl.ac.th

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    Item type:Publication,
    Single Commercially Available Integrated Circuit-based Sinusoidal Oscillators with Amplitude Adjustability and Electronic Control of Condition
    (2024-09-01)
    Duangkaew, Suleeporn
    ;
    Supavarasuwat, Piya
    ;
    Siripruchyanun, Montree
    ;
    Sotner, Roman
    ;
    Jaikla, Winai
    This paper presents four new sinusoidal oscillators using a commercially available integrated circuit (IC). The proposed circuits are simple topologies that employ a single commercial IC, LT1228. It is connected to passive element, consisting of four resistors and two capacitors. All derived oscillator circuits have low output impedance, allowing them to connect to other circuits without requiring an additional buffer. Using an active LT1228 device enables electronic adjustment of parameters in the proposed circuits. A feedback resistor can be used to change the output signal's amplitude without affecting the oscillation's frequency or condition. We performed both simulations using the PSPICE program and experiments to confirm the accuracy of all proposed oscillator circuits. The best total harmonic distortion was 0.13% for the proposed oscillator circuit 3. Adjusting the maximum amplitude using a resistor provides a gain of roughly 1.5–16.5 dB for the proposed oscillator circuit no. 1.
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    Design of low input and high output impedance current-mode biquad filter using CDTAs with independent control of quality factor and pole frequency
    (2013-12-31)
    Sattanaco, Somsak
    ;
    Jaikla, Winai
    ;
    Supavarasuwat, Piya
    ;
    Jaikhang, Wipobh
    In this study, a single-input multiple-outputs current-mode analog biquadratic filter, based on current differencing transconducatance amplifier (CDTA) is presented. The proposed filter uses two CDTAs, one resistor and two grounded capacitors, which is well suited for integrated circuit implementation. The circuit simultaneously gives 3 standard transfer functions, namely, lowpass, highpass and bandpass filters with independent control of quality factor and pole frequency by electronic method. By summing of I<inf>HP</inf> and I<inf>LP</inf>, the notch filter can be also achieved. Moreover, the circuit possesses low input and high output impedance which would be an ideal choice for current-mode cascading. The PSPICE simulation results are included verifying the workability of the proposed filter. The given results agree well with the theoretical anticipation. © 2013 IEEE.