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    Voltage-mode universal filter with one input and five outputs using DDCCTAs and all-grounded passive components
    (2012-08-01)
    Channumsin, Orapin
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    This paper presents a versatile voltage-mode universal active filter with one input and five output terminals. The proposed circuit is based on using the recently reported active building block, namely differential difference current conveyor transconductance amplifier (DDCCTA). It employs two DDCCTAs as active elements together with two resistors and two capacitors as passive elements, which are all grounded. The circuit simultaneously realizes all the five standard biquadratic filter functions; i.e.; lowpass (LP), bandpass (BP), highpass (HP), bandstop (BS) and allpass (AP), without changing circuit topology. The proposed circuit also has the advantage of high-input impedance terminal, and exhibits electronic tunability of its important parameters through the bias current of the DDCCTA as well as low sensitivity performance. PSPICE simulations using 0.5 μm MIETEC CMOS process are used to validate the theoretical predictions. © 2011 Elsevier Ltd. All rights reserved.
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    Dual-mode multifunction filter realized with a single voltage differencing gain amplifier (vdga)
    (2021-01-01) ; ;
    Channumsin, Orapin
    This article presents the dual-mode multifunction biquad filter realized employing only a single voltage differencing gain amplifier (VDGA), one resistor and three capacitors. The proposed filterwith one input and three outputs can configure as voltage-mode or current-mode filter circuit with the appropriate input injection choice. It can also synthesis the three standard filter functions, which are highpass, bandpass, and lowpass responses without modifying the circuit configuration. Orthogonal adjustment between the natural angular frequency (ωo) and the quality factor (Q) of the filter is achieved. Detail analysis of non-ideal VDGA effects and circuit component sensitivity are included. The circuit principle is verified by means of simulation results with TSMC 0.35-μm CMOS process parameters.
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    All-grounded passive element voltage-mode universal filter using single DDCCTA
    (2012-01-01)
    Channumsin, Orapin
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    In this paper, a novel single-input three-output (SITO) second-order multifunction active voltage filter with high-input impedance is proposed. The proposed circuit employs one differential difference current conveyor transconductance amplifier (DDCCTA) as active element together with one grounded resistor and two grounded capacitors as passive elements. The circuit offers the following attractive features : (i) the simultaneous realization of lowpass, bandpass and highpass responses from the same topology, (ii) no requirements for component matching conditions, (iii) electronic controllability of important filter parameters, (iv) simpler structure due to contains only one DDCCTA and three passive elements, and (v) low sensitivity performance. To confirm the theoretical analysis, PSPICE simulation results are included using 0.5 \xm MIETEC CMOS technology parameters.
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    Universal voltage-mode SIFO-type biquad with fully MOS-C realization using DDCCTAs
    (2013-07-01) ;
    Channumsin, Orapin
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    An electronically tunable universal voltage-mode biquad filter which is based on using the newly introduced active building block, namely differential difference current conveyor transconductance amplifier (DDCCTA) is presented in the present paper. The proposed circuit having single input and five output (SIFO) terminals uses two DDCCTAs, two grounded capacitors and two electronic resistors suitable for MOS-C realization. The circuit realizes all the five standard biquadratic filter functions simultaneously without changing circuit topology. In addition, the circuit features the high-input impedance terminal, an electronic control of its natural angular frequency and quality factor. The workability of the proposed circuit has been verified using PSPICE simulations based on CMOS DDCCTA implemented in 0.5 μm MIETEC CMOS technology.
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    Single-current-controlled sinusoidal oscillator with current and voltage outputs using single current-controlled conveyor transconductance amplifier and grounded passive elements
    (2015-04-01) ;
    Channumsin, Orapin
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    This work presents a single-current-controlled (SCC) sinusoidal oscillator that explicitly generates both current and voltage outputs, and employing only a single current-controlled conveyor transconductance amplifier (CCCTA) as the active building block, and three passive components. The presented circuit provides the advantage features of independent electronic control of oscillation condition and oscillation frequency, and use of all grounded passive components. The circuit also exhibits low active and passive sensitivities and permits good frequency stability. Computer simulation results obtained from PSPICE program using 0.35-μm BiCMOS real process parameters are performed to confirm the excellent performance of the proposed oscillator circuit.
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    VDGA-Based Resistorless Mixed-Mode Universal Filter and Dual-Mode Quadrature Oscillator
    (2025-05-01)
    Channumsin, Orapin
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    Tangjit, Jetwara
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    This study introduces an electronically tunable resistorless mixed-mode universal filter and dual-mode quadrature oscillator configuration utilizing merely two voltage differencing gain amplifiers and two grounded capacitors. The suggested filter can perform all generic biquadratic filter functions in all four modes: voltage mode, trans-admittance mode, current mode, and trans-impedance mode, while utilizing the same design. The pole frequency and the quality factor can be tuned electronically and orthogonally by means of the transconductances of the voltage differencing gain amplifier. The dual-mode quadrature oscillator featuring both voltage and current outputs can also be obtained from the proposed filter core. It additionally provides separate electronic control of the oscillation condition and frequency. Several PSPICE simulations with the TSMC 0.18 μm CMOS model confirm the feasibility of the proposed configurations. Both proposed circuits were experimentally evaluated using commercially available integrated circuit LM13600s. Both simulation and experimental results have validated the performance of the design.
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    Single VDGA-based dual-mode multifunction biquadratic filter and quadrature sinusoidal oscillator
    (2020-01-01) ; ;
    Channumsin, Orapin
    This article relates to the realization of voltage-mode and/or current-mode multifunction biquadratic filter and quadrature oscillator circuits each using one voltage differencing gain amplifier (VDGA), two resistors and two grounded capacitors. The proposed dual-mode filter having one output and three inputs can provide the three standard biquadratic transfer functions with both voltage and current output filter responses simultaneously. It also has the independent tuning of the angular resonance frequency and the quality factor. With a slight modification of the proposed filter, a new dual-mode quadrature sinusoidal oscillator can be obtained. The proposed quadrature oscillator provides orthogonal resistive/electronic control of both oscillation condition and oscillation frequency. Non-ideal and parasitic conditions are also examined and their effects on the circuit performance are discussed. To confirm the theory, several computer simulation results with PSPICE program are given.
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    Electronically tunable floating lossy series-type inductance simulator using VDBAs
    (2019-03-16)
    Channumsin, Orapin
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    This study demonstrates a resistorless floating lossy series RL-type inductor circuit utilizing voltage differencing buffered amplifiers (VDBAs) as active elements. The proposed lossy inductance simulator employs a canonical number of active and passive components, namely two VDBAs and only a grounded capacitor. It also realizes transconductance-tunable inductance value without needing any cancellation or element-matching constraints. As an illustrative application, the proposed floating inductor is used to construct a second-order lowpass filter practically. Computer simulation results with the real process 0.25-µm CMOS technology are used to confirm the workability of the proposed circuit and its application.
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    VDGA-Based Resistorless Dual-Mode SIMO Biquadratic Filter
    (2024-01-01)
    Pimpol, Jirapun
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    Channumsin, Orapin
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    This work introduces the synthesis of a resistorless single-input multiple-output dual-mode biquadratic filter. The proposed circuit can perform both voltage-mode and current-mode operations without making circuit modifications. It consists of two voltage differencing gain amplifiers (VDGAs) as an active element, together with only two grounded capacitors as passive elements. Furthermore, it has the capability to produce the conventional biquad filter functions - namely, simultaneous highpass, bandpass, and lowpass responses - in either voltage or current mode. The proposed dual-mode biquad filter can electronically adjust significant filter parameters. TSMC 0.25-μ m CMOS process parameters are utilized in computer simulation to validate the theoretical expectations.
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    Item type:Publication,
    Universal current-mode biquad with minimum components
    (2011-07-26)
    Channumsin, Orapin
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    A current controllable current-mode universal filter with four inputs and one output employing multi-output current-controlled current conveyors (MOCCCIIs) is described. The proposed circuit offers the following attractive features: employment the minimum number of active and passive components, i.e., two MOCCCIIs and two grounded capacitors; simultaneous realization of all the standard filtering functions; independent current-control of the natural angular frequency (ω<inf>0</inf>) and bandwidth (BW); no requirement of component matching conditions; employment of only two grounded passive capacitors which is suitable for integrated circuit (IC) implementation; and low passive and active sensitivities.