Roongmuanpha, Natchanai

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Roongmuanpha, Natchanai
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natchanai.ro@kmitl.ac.th

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    Dual-Mode Biquadratic Filter Employing Second-Generation Voltage Conveyors DM Biquadratic Filter Employing VCIIs
    (2024-02-21)
    Roongmuanpha, Natchanai
    ;
    Mongkolwai, Pratya
    ;
    Pukkalanun, Tattaya
    ;
    Tangsrirat, Worapong
    In this paper, a dual-mode biquadratic filter is suggested. The proposed filter employs two Second-Generation Voltage Conveyors (VCIIs) along with four resistors and two capacitors. The suggested filter can realize all five standard biquadratic filter functions such as lowpass (LP), bandpass (BP), highpass (HP), bandstop (BS), and allpass (AP) in both voltage-mode (VM) and current-mode (CM) without needing to modify its circuit structure. The quality factor (Q) and natural angular frequency (ωo) can be accurately and separately controlled through the passive component. It additionally offers the capability of providing the output voltage at the low-output impedance terminal in VM. The effects of the VCII non-idealities on the filter performance have been analyzed in detail. The proposed filter also offers low active and passive sensitivity features. Simulation results achieved with PSPICE software using TSMC CMOS 0.18 μm parameter have been validated and compared with the theoretical findings.
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    Floating Inductance Simulator with Electronic Tuning Property Using only Active Elements
    (2023-01-01)
    Roongmuanpha, Natchanai
    ;
    Mongkolwai, Pratya
    ;
    Pukkalanun, Tattaya
    ;
    Dumawipata, Teerasilapa
    ;
    Tangsrirat, Worapong
    This paper discusses the active-only electronically tunable floating lossless inductance simulator, which uses a single fully balanced-voltage differencing buffered amplifier (FB-VDBA) and one operational amplifier (OA). For this implementation, only integrated circuit packages with no external passive components are utilized. The synthetic equivalent inductance value is electronically adjustable via the transconductance gain of the FB-VDBA. Non-idealities of the active element have produced their effects. Using PSPICE with TSMC 0.25-mum CMOS parameter and the LM741 type OA, the performance of the proposed circuit and its application as a second-order voltage-mode lowpass filter is demonstrated. The numerical simulations closely matched the theoretical results.
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    CMOS Voltage differencing transconductance amplifier with linearly adjustable transconductance gains
    (2019-07-01)
    Roongmuanpha, Natchanai
    ;
    Mongkolwai, Pratya
    ;
    Pukkalanun, Tattaya
    ;
    Tangsrirat, Worapong
    In this work, a circuit configuration for the realization the CMOS voltage differencing transconductance amplifier (VDTA) with linear tunable transconductance and wide-input dynamic range is introduced. The circuit design technique is achieved by squaring the long-tail bias current of the differential-input voltage-to-current converter circuit. In addition, the linearity region of the input signal is also improved by using source degeneration technique. The workability of the proposed linearly tunable VDTA has been shown on the construction of the electronically controllable first-order allpass filter circuit. The proposed circuit and its application are investigated and simulated with PSPICE software using TSMC 0.25μm CMOS technology.