Roongmuanpha, Natchanai
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Preferred name
Roongmuanpha, Natchanai
Main Affiliation
Email
natchanai.ro@kmitl.ac.th
19 results
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Item type:Publication, Cascadable First-Order and Second-Order Inverse Filters Based on Second-Generation Voltage Conveyors(2025-02-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Two-Quadrant Current-Mode Logarithmic and Anti-logarithmic Amplifiers with Temperature CompensationThis paper proposes circuit topologies for realizing two-quadrant current-mode logarithmic and anti logarithmic amplifier configurations with temperature compensation. The design approach employs the translinear approach to generate the output currents that directly correspond to the absolute values of the logarithmic and anti logarithmic functions. The proposed circuits can operate at a low-level supply voltage of 2V with both input and output current signals. A detailed examination of the non-ideal circuit performance has also been considered. To validate their functionality and illustrate their superior thermal stability, the developed circuits have been simulated. All simulations were conducted via PSPICE for a real bipolar transistor model of the HFA3096 technology. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Floating capacitance multiplier realization based on commercially available integrated circuits(2022-06-01); This article is an attempt to present a tunable floating capacitance multiplier using commercially available integrated circuits, namely LT1228. The proposed design utilizes three LT1228s as active electronic components and only one capacitor as a passive component. The multiplication factor of the capacitance multiplier is electronically tunable via adjusting the external supply currents of the LT1228s. Besides, a careful analysis of the parasitic element effects is also included. To verify the practical features of the proposed floating capacitance multiplier circuit, several simulations using PSPICE program tool and extensive laboratory measurements were performed. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Finite-Time Integral Backstepping Nonsingular Terminal Sliding Mode Control to Synchronize a New Six-Term Chaotic System and Its Circuit Implementation(2023-01-01); ; This work presents the finite-time synchronization of a new six-term chaotic system with only stable equilibria and its circuitry implementation. The chaotic system is designed in such a way that its complex dynamical behavior, including hidden attractors, can be adjusted through only one parameter, whilst allowing transformation to chaotic flows via invariant transformations. A finite-time chaotic synchronizer is designed via a nonsingular terminal integral backstepping sliding mode controller, with reduced theoretical finite-time convergence, and a modified sliding surface, to accommodate analog circuitry implementations. A comparison between the proposed controller against conventional integral backstepping sliding mode controller showed that active synchronization is achieved in finite time. Finally, analog circuitry implementation for both open-loop and closed-loop configurations is realized via commercially available active components such as LF357 and AD633. The descriptive circuitry equations for both configurations are designed to mimic the actual governing control equations for simplicity and ease of circuit troubleshooting. The workability of both configurations was tested in OrCAD PSpice. Results show that the master and slave systems were found to be in synchronization with less than 0.95% maximum errors. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Floating general immittance function simulator(2021-04-01); A floating general immittance function simulator circuit is presented using two differential voltage to current converters (DVTCs) and three passive components. The developed DVTC to be used in this work is realized with the flipped voltage follower, achieving low-voltage operation. By selecting proper passive components, the proposed floating simulator circuit can realize synthetic inductor, capacitor, resistor and frequency-dependent negative resistance (FDNR) without changing its configuration. No component matching conditions and cancellation constraints are necessary. Furthermore, non-ideal transfer gain effects on the proposed simulator circuit are discussed. As applications for the proposed floating simulator, a second-order RLC bandpass filter and a fourth-order resistively terminated LC bandpass filter are shown. To verify the theory, the proposed simulator and its applications are simulated using 0.25-μm CMOS process technology. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, VDTA-Based Mixed-Mode Inverse Filter and Its Application to Mixed-Mode PID Controller(2026-04-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Grounded Series and Parallel RL/RC Immittance Simulators Using a Single Second-Generation Voltage Conveyor(2026-01-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Single VDGA-Based Mixed-Mode Electronically Tunable First-Order Universal Filter(2023-03-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Design of Mixed-Mode Analog PID Controller with CFOAs(2024-05-01); ; The design of a mixed-mode proportional-integral-derivative (PID) controller circuit using current-feedback operational amplifiers (CFOAs) as active components is proposed. With the same circuit topology, the proposed configuration of three CFOAs, four resistors, and two capacitors is capable of performing the PID controller in each of the following four modes: voltage mode, trans-admittance mode, current mode, and trans-impedance mode. Numerous mathematical analyses are conducted to determine the controller’s performance under both ideal and non-ideal conditions. Additionally, the mixed-mode second-order lowpass filter is suggested and also used to examine the workability of the proposed mixed-mode PID controller in a feedback control structure. The proposed PID controller is implemented with the commercially available IC-type CFOA AD844, and the simulation results are presented to illustrate the functionality of the controller and its closed-loop control system. According to the findings, the total power consumption of the proposed PID controller is 0.348 W, with symmetrical supply voltages of ±9 V. It also has a temperature variation of less than 0.2% over the AD844’s usable range. Monte Carlo statistical analysis results revealed that the gain responses of the controller exhibited a deviation of no more than 7.72% from the theoretical value. The controlled filter in a closed-loop control system has a 43% faster rise time and peak time than the uncontrolled filter in all four modes of operation. It also has a steady-state error less than 0.2 mV for voltage responses and 0.72 µA for current responses. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Tunable mixed-mode voltage differencing buffered amplifier-based universal filter with independently high-q factor controllability(2021-10-01);