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Grounded Immittance Simulation and PID Control Application
(2026-01-01)
Channumsin, Orapin
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Unhavanich, Sumalee
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Roongmuanpha, Natchanai
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Tangsrirat, Worapong
This communication introduces a grounded immittance function simulator. The circuit employs a single differential voltage to current converter (DVTC) in association with three passive elements. The grounded series type RL and RC simulator can be realized by selecting the proper position of all passive elements. The equivalent resistance, inductance, and capacitance accomplished from the proposed circuit can be adjusted with a passive resistor. DVTC non-idealities on the proposed simulator are also discussed in detail. The voltage mode PID controller has been suggested as an application using the proposed simulator. The performance of the proposed simulator and controller applications have been carried out through PSPICE simulation. The results are certified by the theoretical prediction.
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Practical Realization of Only Active Floating Lossless Inductance Simulator
(2024-01-01)
Roongmuanpha, Natchanai
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Unhavanich, Sumalee
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Pukkalanun, Tattaya
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Tangsrirat, Worapong
This paper describes an electronically controllable floating lossless inductance simulator circuit implemented with only off-the-shelf available integrated circuits, namely LT1228 and operational amplifier (OA). The proposed design consists solely of two LT1228s and a single OA. By using an active element named LT1228, the equivalent inductance can be tuned electronically with depended on the externally supplied current applied to LT1228. The proposed simulator imposed just one component matching restriction that required the equality of two transconductances. It is easily attainable with a simple current mirror. The worthiness of the proposed floating inductance simulator has been proven and applied to the construction of the 2nd-order RLC highpass/bandpass filter as an application. PSPICE simulations are used to investigate the characteristics of the proposed simulator and its filter realization.
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Simple current-controlled VDTA-R schmitt trigger circuit
(2019-07-01)
Moonmuang, Pitchayanin
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Unhavanich, Sumalee
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Tangsrirat, Worapong
A simple current-controlled Schmitt trigger circuit employing single voltage differencing transconductance amplifier (VDTA) and only two grounded resistors is presented. The proposed Schmitt trigger circuit offers independent electronic adjustability of its threshold voltage levels and output voltage amplitudes by the help of corresponding VDTA bias currents. In addition, both clockwise and counter-clockwise hystereses are also achievable. To justify the theoretical predictions, the verification of the proposed Schmitt trigger circuit is performed by PSPICE simulation software using TSMC 0.25μm CMOS technology.
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Actively simulated floating lossless inductor for short range wireless communication
(2019-01-01)
Moonmuang, Pitchayanin
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Pukkalanun, Tattaya
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Unhavanich, Sumalee
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Tangsrirat, Worapong
This communication describes the resistorless simulation of the floating lossless inductor using three voltage differencing buffered amplifiers (VDBAs) and one grounded capacitor. The circuit employs only a grounded capacitor, and no other extra resistor element is employed. Thus, it is suitable for further communication integrated front-end circuit design in short-range wireless and application. The realized equivalent inductance value of the simulated inductor can be changed electronically via the external biasing currents of the VDBAs. Sufficient simulation results with the PSPICE program are provided to validate the functionality of the realized inductor. In addition to establishing the practical operation of the simulator, the measured test results obtained from hardware implementation using readily available integrated chips (ICs) are also included.
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Active simulation of electronically tunable grounded lossless inductor using voltage differencing inverting buffered amplifiers
(2018-08-13)
Roongmuanpha, Natchanai
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Unhavanich, Sumalee
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Tangsrirat, Worapong
An actively simulated grounded lossless inductor based on employing voltage differencing inverting buffered amplifiers (VDIBAs) as new active components has been presented. The synthetic canonical inductor uses only two VDIBAs and one grounded capacitor. The simulator provides the advantage feature of electronic control of its equivalent inductance via the transconductance parameter of the VDIBA, and also does not need critical element matching conditions. An illustrative application of the proposed tunable grounded lossless inductor on the realization of an active RLC second-order bandpass filter has been designed. The usability of the proposed circuit has been evaluated using PSPICE simulations based on VDIBA implemented in TSMC 0.25-μ m CMOS technology, and the simulated results demonstrate a sufficient agreement with the theoretical conclusions.
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Single-input three-output dual-mode universal biquad realization based on floating-current-source building blocks
(2017-11-03)
Mongkolwai, Pratya
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Unhavanich, Sumalee
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Tangsrirat, Worapong
A novel dual-mode universal biquadraic filter with one input and three outputs is presented, which contains only two floating current sources (FCSs), and four external passive components. The presented filter exhibits the following properties : capable of working either voltage-mode or current-mode, electronically controllable of the natural angular frequency (Ω<inf>o</inf>) by means of the transconductance gains, independent grounded-resistance control of the quality factor (Q), simultaneous realization of all the three basic filtering signals, no component matching constraints and low active and passive component sensitivities. To confirm the theory, the proposed circuit is simulated with PSPICE program using TSMC 0.25-μm CMOS technology.
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SFG actualization of general thorder voltage transfer functions using VDBAs
(2016-01-01)
Onjan, Oosana
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Unhavanich, Sumalee
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Tangsrirat, Worapong
T his work presents the synthesis of general the order voltage transfer functions with voltage differencing buffered amplifiers (VDBAs) using signal flow graph (SFG) technique. \Vithout the employment of external passive resistors, the designed procedure requires only n VDBAS and n capacitors for nth order transfer functIon realization. As application examples, the first-order alipass and standard biquadratic function realizations are demonstrated. The simulation results by PSPICE have also been provided, which verify the usefulness of the presented technique.
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Tunable capacitance multiplier with a single voltage differencing buffered amplifier
(2016-01-01)
Unhavanich, Sumalee
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Onjan, Oosana
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Tangsrirat, Worapong
This work describes the grounded electronically tunable capacitance multiplier circuit using voltage differencing buffered amplifier (VDBA) as an active element. The proposed capacitance simulator is simulated using one VDBA, one floating capacitor and one grounded resistor. The realized equivalent capacitance can be tuned electronically through the (ransconductance gain of the VDBA. The effect of the VDBA non-idealitles on the realized equivalent capacitance has also been discussed in detail. As an application, active RC lowpass filter is realized using the proposed tunable capacitance simulator. PSPICE simulation results show a good agreement with the theoretical analysis, and veri1 the behaviors of the proposed simulator and its application.
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Voltage differencing transconductance amplifier-based floating simulators with a single grounded capacitor
(2014-01-01)
Tangsrirat, Worapong
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Unhavanich, Sumalee
Two simple configurations for simulating the resistorless floating inductor and capacitor using voltage differencing transconductance amplifier (VDTA) as a novel active element have been presented in this paper. The proposed floating simulated inductance circuit uses only one VDTA and one grounded capacitor, whereas the proposed floating simulated capacitance circuit uses two VDTAs and one grounded capacitor. The equivalent values of the realized simulators can be tuned electronically through the transconductance parameter of the VDTA. Both of the circuits also do not require any realization conditions. The proposed circuits together with their applications are demonstrated using PSPICE simulation with 0.35 μm TSMC CMOS technology. Copyright © 2012 The Council of Scientific and Industrial Research.
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Signal flow graph realization of single-input five-output current-mode universal biquad using current follower transconductance amplifiers
(2014-01-01)
Tangsrirat, Worapong
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Unhavanich, Sumalee
In this paper, a design procedure for the realization of all current-mode biquadratic transfer functions is presented. The synthesis technique is deduced from a signal flow graph representation using current follower transconductance amplifiers (CFTAs). The proposed configuration has single low-impedance input and five high-impedance outputs, and comprises three CFTAs and two grounded capacitors. No passive resistor is required for the circuit realization, thus it is an active-C structure suitable for integration.

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