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Author: search.filters.author.Lorsawatsiri, Anuree

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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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    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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    Current-mode squaring, square-rooting and vector summation circuits
    (2010-05-01)
    Petchakit, Wijittra
    ;
    Lorsawatsiri, Anuree
    ;
    Kiranon, Wiwat
    ;
    Wongtaychathum, Chariya
    ;
    Wardkein, Paramote
    This paper presents new current-mode squaring, square-rooting and vector summation circuits based on the second generation current controlled conveyor (CCCII). Consisting of only CCCIIs as active elements not requiring any external passive elements, all of the proposed circuits are capable of high frequency operation and well suited for IC fabrication. Moreover, the circuits performances are insensitive to temperature and their gains can be easily adjusted by varying the input bias current of CCCII. Finally, the simulation results of the proposed squaring, square-rooting and a two-input vector summation circuits are depicted to confirm the theoretical analysis. © 2009 Elsevier GmbH. All rights reserved.