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Author: search.filters.author.Pukkalanun, TattayaSubject: search.filters.subject.electronically tunable

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    Dual-Mode Tunable First-Order Universal Filters with Single VDGA
    (2024-01-01)
    Roongmuanpha, Natchanai
    ;
    Pukkalanun, Tattaya
    ;
    Tangsrirat, Worapong
    This article explores two compact structures to implement dual-mode first-order universal filters, providing lowpass, highpass, and allpass responses from the same structure. Both circuits offer savings in active components as they employ a single voltage differencing gain amplifier (VDGA). The first proposed filter has voltage inputs and current/voltage outputs with a single capacitor, which can perform three distinct filter functions in both voltage mode (VM) and trans-admittance mode (TAM). The latter filter, with current inputs and current/voltage outputs, consists of one capacitor and one resistor, which is capable of operating in both current mode (CM) and trans-impedance mode (TIM). Both of the proposed filters also offer an electronic adjustment of the passband gain and pole frequency through the VDGA’s transconductance values. The non-ideal implications of the VDGA on the first-order filters' performance are thoroughly examined. Computer simulations and experimental testing measurements validate the theoretical analyses.
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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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    High-Input-Impedance Four-Input Single-Output Voltage-Mode Biquadratic Filter with Only VDTAs and Grounded Capacitors
    (2022-01-01)
    Satansup, Jetsdaporn
    ;
    Pukkalanun, Tattaya
    ;
    Tangsrirat, Worapong
    This paper presents a voltage-mode universal biquadratic filter with voltage differencing transconductance amplifiers (VDTAs) as active components. The proposed filter comprises four inputs and a single output and can perform all five general biquadratic filter functions, namely lowpass, bandpass, highpass, bandstop, and allpass responses, without modifying the circuit architecture. It also offers the advantages of resistorless implementation with only two grounded capacitors, orthogonal adjustment of the natural angular frequency and the quality factor, as well as the absence of any constraint related to the values of input signals. Moreover, because the circuit contains all of the high input impedance levels, it may be cascaded without the requirement of additional buffers. The suggested filter's functioning has been validated by simulations using the PSPICE application.
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    Three-Input One-Output Voltage-Mode Biquadratic Filter Using Single VDBA
    (2020-03-01)
    Roongmuanpha, Natchanai
    ;
    Pukkalanun, Tattaya
    ;
    Tangsrirat, Worapong
    In this article, a voltage-mode universal biquadratic filter with triple inputs and single output (TISO) is presented. The circuit consists of only one voltage differencing buffered amplifier (VDBA) along with two capacitors and one resistor. The proposed circuit can realize all five standard biquadratic filter functions namely, lowpass (LP), highpass (HP), bandpass (BP), bandstop (BS) and allpass (AP) without disturbing the circuit structure. The quality factor (Q) and the natural angular frequency (ωo) of the proposed circuit can be controlled by means of the transconductance gain of the VDBA. The circuit also provides low sensitivity performance. The potentiality of the proposed TISO biquadratic filter has been proved by PSPICE program based on TSMC 0.25-μm CMOS technology.
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    On The Realization of Simulated Lossy Inductors Using Voltage Differencing Buffered Amplifiers
    (2020-03-01)
    Moonmuang, Pitchayanin
    ;
    Roongmuanpha, Natchanai
    ;
    Pukkalanun, Tattaya
    ;
    Tangsrirat, Worapong
    This paper reports four topologies, all simulating floating/grounded lossy inductors, using voltage differencing buffered amplifiers (VDBAs) as active elements. The simulated equivalent resistance and inductance values of the simulators can be adjusted electronically through the VDBA transconductance parameter. Non-ideal gain outcomes of the VDBA on the realized inductor circuits are finalized. The critical active and passive sensitivities are obtained to be low.
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    Grounded lossy parallel inductance simulation using voltage differencing buffered amplifier
    (2017-11-03)
    Roongmuanpha, Natchanai
    ;
    Pukkalanun, Tattaya
    ;
    Tangsrirat, Worapong
    An actively lossy parallel RL-type inductance simulation employing voltage differencing buffered amplifier (VDBA) as an active component is presented. The proposed grounded inductance simulator is realized with a single VDBA, one grounded capacitor and one floating resistor. The equivalent inductance value of the simulator can be adjusted electronically through the transconductance parameter of the VDBA. The effect of the VDBA non-idealities on the realized simulator is analyzed in detail. As an application, active second-order current-mode highpass/bandpass filter is designed using the proposed variable lossy inductance simulator. The PSPICE simulation results using TSMC 0.25-μm CMOS technology demonstrate a close agreement with the theory, and also verify the usefulness of the proposed simulator and its filter design application.