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Single VDCC-Based Mixed-Mode First-Order Universal Filter and Applications in Bio-Signal Processing Systems
(2026-02-01)
Moonmuang, Pitchayanin
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Roongmuanpha, Natchanai
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Tangsrirat, Worapong
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Pukkalanun, Tattaya
This paper presents a compact mixed-mode first-order universal filter based on a single voltage differencing current conveyor (VDCC), which can function in all four possible operation modes, i.e., voltage mode (VM), trans-admittance mode (TAM), current mode (CM), and trans-impedance mode (TIM). The proposed configuration requires only two grounded resistors and one floating capacitor, which contributes to a low component count, facilitates integration, and allows for the electronic tunability of the pole frequency through the transconductance gain of the VDCC. This work also demonstrates two practical biomedical applications: an electrocardiogram (ECG) acquisition system utilizing the VM low-pass filter for noise suppression and a bioimpedance (BioZ) measurement system employing the proposed configuration-based CM oscillator circuit as a sinusoidal excitation source. The performance validation confirms the accuracy of impedance extraction and the preservation of waveforms using tissue-equivalent models. The results demonstrate that the proposed VDCC-based filter offers a compact, power-efficient, and versatile analog signal-processing solution suitable for modern biomedical instrumentation.
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Synchronization of a Seven-Term Chaotic 4D System Using a Simplified Fixed-Time Adaptive Integral Nonsingular Terminal Sliding Mode Control and Its Circuit Realization
(2024-01-01)
Wongvanich, Napasool
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Moonmuang, Pitchayanin
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Roongmuanpha, Natchanai
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Tangsrirat, Worapong
This work presents an adaptive gain fixed-time synchronization of a seven-term hyperchaotic 4D system, along with its analog circuitry realizations. To facilitate a simplistic circuit realization of the closed loop system, the control design process initiates with the design of a novel, simplified fixed-time stability lemma that gives a lower convergence time, while being easier to compute. A nonlinear, fixed-time adaptive-gain nonsingular terminal sliding mode controller was then designed to synchronize the hyperchaotic 4D system. Theoretical analyses successfully achieved fixed-time synchronization, and computer simulations verified the achievement of zero-error convergence across all states within 1 second, irrespective of the initial conditions and even in the presence of significant parameter and disturbance changes. Analog circuitry implementations of the adaptive gain fixed-time chaotic synchronization configuration were realized using commercially available components, for instance, LF357 and AD633. The circuit equations were devised to replicate those used in the controller, with the goal of facilitating troubleshooting by ensuring simplicity. Electronics workability was tested using PSPICE simulation program. The results demonstrated that active synchronization was achieved in fixed time with less than 1% error across the states in the presence of disturbances. Finally, the developed fixed-time chaotic synchronization was applied to a secure communication system. The results indicate that the original and recovered messages exhibit a high degree of similarity to each other after a fixed duration of 1 second.
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VDTA-based floating/grounded series/parallel R-L and R-C immittance simulators with a single grounded capacitor
(2023-02-01)
Moonmuang, Pitchayanin
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Faseehuddin, Mohammad
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Pukkalanun, Tattaya
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Herencsar, Norbert
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Tangsrirat, Worapong
Active configurations for simulating floating/grounded series and parallel immittance functions based on voltage differencing transconductance amplifiers (VDTAs) are proposed. The grounded series and parallel immittance simulators presented here require only one VDTA, while the proposed floating ones only need two. Each of the suggested simulators uses a single grounded capacitor. The proposed topologies can imitate R-L and R-C immittances in both series and parallel types. All of the simulated equivalent elements are electronically adjustable through the VDTA's transconductance. Furthermore, no component-matching restrictions are imposed in order to achieve the appropriate immittance function. Applications of the proposed VDTA-based immittance simulators include bandpass filter and quadrature oscillator implementations. The behaviors of the proposed circuits and their applications are evaluated by PSPICE simulations and experimental observations using VDTA implemented with commercially available CA3080 type OTAs.
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Single VDTA-Based Tunable Floating Lossy Inductance Simulation Circuits
(2023-01-01)
Moonmuang, Pitchayanin
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Tangsrirat, Worapong
In this study, two circuit topologies for simulating tunable lossy floating inductors are proposed. In each design, the simulators make use of a single voltage differencing transconductance amplifier (VDTA), and only two passive elements with a grounded capacitor. The proposed active inductance simulators do not need some kind of component matching conditions and cancellation constraints for the desired realization. Besides, the simulated equivalent resistance and inductance values are independently tunable through a single resistor and/or the transconductances of the VDTA. The workability of all the proposed circuits is well accomplished through PSPICE simulations and experimental test results. To ascertain the feasibility of the proposed inductor designs, they are used to construct a fourth-order equal-ripple (3-dB) lowpass filter and an electronically tunable sinusoidal oscillator.
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Grounded Series/Parallel RC Impedance Simulators with a Single VDBA
(2023-01-01)
Moonmuang, Pitchayanin
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Pukkalanun, Tattaya
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Fukuhara, Masaaki
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Tangsrirat, Worapong
This article presents grounded RC series/parallel impedance simulator circuits employing a single voltage differencing buffered amplifier (VDBA) as an active element. The proposed RC series impedance simulator consists of one capacitor and one resistor, while the proposed grounded RC parallel type requires only a single capacitor as a passive element. The simulated equivalent resistance and capacitance values can be tuned electronically through the transconductance gain of VDBA device which can be adjusted by means of the external biasing current. The performance validation of the proposed circuits including the resonant circuit application is proved by simulation results via PSPICE software based on TSMC 0.25-μ m CMOS technology.
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Floating/grounded series/parallel R-L, R-C and L-C immittance simulators employing VDTAs and only two grounded passive elements
(2022-02-01)
Moonmuang, Pitchayanin
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Pukkalanun, Tattaya
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Tangsrirat, Worapong
In this paper, four floating/grounded series and parallel immittance simulator topologies are proposed, utilizing voltage differencing transconductance amplifiers (VDTAs) as useful active devices. Each of the proposed topologies requires only two grounded passive components. The floating series and parallel simulated immittance circuits proposed here require just two VDTAs, whilst the grounded ones require only one. The proposed topologies can simulate R-L, R-C, and L-C immittances in series and parallel. All of the simulated equivalent elements for the realized immittances are orthogonal adjustable. Furthermore, there are no critical element equality criteria required for the desired immittance function realization. The behavior of the proposed VDTA-based immittance simulators is exemplified in LC ladder filter and sinusoidal oscillator applications. To illustrate the simulator's performance, PSPICE simulation and experimental test results are used.
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Grounded Parallel RL, RC, and LC Immittance Simulators Using VDBAs and Passive Elements
(2022-01-01)
Mongkolwai, Pratya
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Moonmuang, Pitchayanin
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Pukkalanun, Tattaya
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Tangsrirat, Worapong
This communication suggests a grounded parallel RL, RC, and LC immittance simulator. In this circuit, two voltage differencing buffered amplifiers (VDBAs) with two passive components are proposed. The VDBA device's transconductance gain can be used to electronically adjust the realized equivalent resistance (Req), inductance (Leq), and capacitance (Ceq), which is conditional on the choice of the passive element. The effect of the VDBA's non-idealities on the realized simulator is studied in this research. The second order voltage mode bandpass filter is realized using the proposed active LC parallel simulator, which is simulated using the PSPICE simulation program to ensure that it operates as desired.
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Grounded Series/Parallel RL/RC Immittance Simulations with a Single VDTA
(2022-01-01)
Pukkalanun, Tattaya
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Moonmuang, Pitchayanin
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Tangsrirat, Worapong
This paper discusses actively simulated RL and RC immittance simulator circuits. Only one voltage difference transconductance amplifier (VDTA) and one grounded capacitor are required for each realized simulator. The proposed simulator concept can realize all the possible series and parallel RL/RC impedance functions, with the simulated equivalent elements being tunable both electronically and separately through the VDTA's transconductance gains. The impacts of VDTA non-idealities on realized simulator performance are examined. The numerical simulations using PSPICE program, as well as experimental measurements utilizing commercially available IC CA3080s, are provided to prove the practicability of the circuits.
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Voltage Differencing Gain Amplifier-Based Shadow Filter: A Comparison Study
(2020-07-01)
Moonmuang, Pitchayanin
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Pukkalanun, Tattaya
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Tangsrirat, Worapong
This study determines the voltage-mode shadow filter realization based on voltage differencing gain amplifier (VDGA) in comparison with a classical second-order filter. The realized shadow filter uses three VDGAs and only two grounded capacitors, and can simultaneously realize second-order lowpass and bandpass filter responses. The natural angular frequency (ωA) and the quality factor (QA) can be tuned by means of the VDGAs' transconductance gains. The performance comparison between the realized shadow filter and the classical second-order filter is demonstrated through simulation results with 0.25μm CMOS technology.
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On The Realization of Simulated Lossy Inductors Using Voltage Differencing Buffered Amplifiers
(2020-03-01)
Moonmuang, Pitchayanin
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Roongmuanpha, Natchanai
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Pukkalanun, Tattaya
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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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