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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
;
Pukkalanun, Tattaya
;
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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Voltage differencing buffered amplifier-based electronically tunable grounded capacitance multiplier
(2019-03-16)
Moonmuang, Pitchayanin
;
Pukkalanun, Tattaya
;
Tangsrirat, Worapong
A minimal realization of electronically adjustable capacitance multiplication topology with voltage differencing buffered amplifier (VDBA) is proposed. The proposed capacitance multiplier circuit is designed by means of two VDBAs and one floating capacitor. A capacitance multiplication factor is adjusted electronically through the ratio of two transconductances. The effect of the non-ideal gains of the VDBA is also taken into account and carried out. As an analog application example, the proposed capacitance multiplier circuit is utilized in the design of an electronically tunable first-order low-pass filter. PSPICE simulations with TSMC 0.25-µm CMOS technology are included to support the theoretical analysis.
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VDBA-based electronically tunable capacitance multiplier with a grounded capacitor
(2018-07-02)
Moonmuang, Pitchayanin
;
Pukkalanun, Tattaya
;
Tangsrirat, Worapong
This work presents an electronically tunable grounded capacitance multiplier circuit based on the voltage differencing buffered amplifier (VDBA), a recently introduced active building block. The proposed capacitor circuit requires only two VDBAs, one floating resistor, and one grounded capacitor. The circuit can be tuned electronically via the VDBA transconductance ratio. The effect of the VDBA non-idealities on the simulated capacitance value has also been discussed in detail. The usability of the proposed tunable capacitance simulator has been verified by realizing the fourth-order low-pass filter application with a Butterworth approximation. In order to verify the theory, the behavior of the circuits is evaluated with PSPICE simulation program using TSMC 0.25-µm CMOS process parameters.
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Electronically tunable resistorless capacitance multiplier employing VDBAs
(2017-11-24)
Moonmuang, Pitchayanin
;
Tangsrirat, Worapong
This work focuses on a circuit configuration for the simulation of the resistorless tunable grounded capacitance multiplier using the recently introduced active building block called voltage differencing buffered amplifier (VDBA). The proposed capacitance multiplier circuit consists of only two VDBAs, and one floating capacitor, without requiring critical matching conditions. The realized equivalent capacitance value can be tuned electronically through the ratio of the transconductance gain of the VDBA. The effect of the VDBA non-idealities on the realized equivalent capacitance has also been investigated in detail. As an application, an illustrative RLC low-pass filter using the proposed tunable capacitance simulator has been provided. In order to demonstrate the behavior of the circuit and confirm the theory, PSPICE simulation results with TSMC 0.25-µm CMOS technology are included.
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Tunable capacitance multiplier with a single voltage differencing buffered amplifier
(2016-01-01)
Unhavanich, Sumalee
;
Onjan, Oosana
;
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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Generalized impedance function simulator using voltage differencing buffered amplifiers (VDBAs)
(2016-01-01)
Mongkolwai, Pratya
;
Tangsrirat, Worapong
A circuit topology for simulating grounded inductor, capacitance multiplier and frequency-dependent negative resistor (FDNR) depending on the passive component choice is presented. The presented general impedance function simulator employs two voltage differenclng buffered amplifiers (VDBAs) and three various passive components. The realized equivalent impedance values can be tuned electronically via the transconductance gains of the VDBAS. The simulator does not need any component matching constraints, and also exhibits low active and passive sensitivities. To verify the theory and to exhibit the circuit performance, computer simulation results using PSPICE are provided.

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