Wongtaychatham, Chariya

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Wongtaychatham, Chariya
Alternative Name
Wongtaychatham, C.
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Email
chariya.wo@kmitl.ac.th

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    Fully active and minimal shadow bandpass filter
    (2018-08-13)
    Buakaew, Seangrawee
    ;
    Narksarp, Wipavan
    ;
    Wongtaychatham, Chariya
    A new topology of shadow bandpass filters is presented in this paper. The proposed circuit employs the active building block of three voltage differencing transconductance amplifiers (VDTA) along with two grounded capacitors. This results in an additional attractive feature of being fully active and minimal component-count. Practical realization of the VDTA is also given and employed for circuit verification. PSPICE simulation with model parameters of 0.18μ m CMOS technology is included to confirm the filter functionality of the proposed filter.
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    Novel resistorless mixed-mode PID controller with improved low-frequency performance
    (2013-10-22)
    Silaruam, Vinai
    ;
    Lorsawatsiri, Anuree
    ;
    Wongtaychatham, Chariya
    This paper introduces a new resistorless mixedmode proportional-integral-derivative (PID) controller. It employs six simple transconductors and only two grounded capacitors. The proposed PID controller offers several advantageous features of resistorless configuration, use of grounded capacitors, independent electronic-tuning characteristic of its parameters, and mixed-mode operation such as current, transimpedance, transadmittance, and voltage modes. The parasitic element effects of the transconductors on the proposed controller are investigated and the improved low-frequency performance of the proposed controller is then discussed. As applications, the proposed controller is demonstrated on two closed-loop systems. The PSPICE simulations with TSMC 0.18μm CMOS process and ±0.9 V supply voltage verify the theoretical analysis.
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    Shadow bandpass filter with Q-improvement
    (2019-07-01)
    Buakaew, Seangrawee
    ;
    Narksarp, Wipavan
    ;
    Wongtaychatham, Chariya
    A new architecture of the shadow bandpass filters with the quality factor improvement is proposed. The presented idea employs external amplifiers cooperating with the classical biquad cell resulting in convenient electronic tunability of the characteristic frequency and the quality factor. The scheme obtains the benefit of the quality factor-improvement via feedback gains of the external amplifiers. The theory is verified by PSPICE simulation using 0.18 μm CMOS technology model parameters.
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    Architecture for instantaneous frequency and amplitude detection
    (2011-03-01)
    Lorsawatsiri, Anuree
    ;
    Kiranon, Wiwat
    ;
    Wongtaychatham, Chariya
    ;
    Sangpisit, Wipa
    ;
    Wardkein, Paramote
    This paper presents a new architecture to detect the frequency and amplitude of sinusoidal signals. The proposed architecture employs merely differentiators and analog computational units to gain an accurate and instantaneous response. The detected output of the frequency measuring module is linear with frequencies and insensitive to the peak amplitude of the input signal, and vice versa. Moreover, the sensitivity (gain) of frequency detection module and that of amplitude detection module are orthogonally adjusted. The simulation results are then given to verify the theoretical analyses. The results also include various set of simulation aiming to give substantive measures of satisfactory performance of the proposed method. © 2010 Elsevier GmbH. All rights reserved.
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    PIDA Controller Realized on Commercial IC Current Feedback Operational Amplifiers
    (2017-01-01)
    Buakaew, S.
    ;
    Narksarp, W.
    ;
    Wongtaychatham, C.
    ;
    Sangpisit, W.
    In this paper, the circuit-realization of the proportional – integral – derivative – acceleration (PIDA) controller is presented. The circuit is realized with commercially available active components i.e. only four current feedback operational amplifiers (CFOAs) along with passive R and C components. The parameters of the PIDA controller including the proportional gain, the integral time, the derivative time and acceleration gain can be easily adjusted via these resistors and/or capacitors. The proposed PIDA controller offers simple structure with a small number of active elements to be used. The computer simulations results utilizing commercial IC AD844 are demonstrated to confirm the validity of the proposed PIDA controllers.