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Author: search.filters.author.Saksiri, Wiset

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    Second-generation voltage conveyor-based first-order all-pass filters and application to quadrature sinusoidal oscillator
    (2025-02-01)
    Jaikla, Winai
    ;
    Theppota, Burin
    ;
    Saksiri, Wiset
    ;
    Khateb, Fabian
    ;
    Siripruchyanun, Montree
    This article describes 2 first-order voltage-mode all-pass filters (APFs) covering leading and lagging phases based on single capacitor and second-generation voltage conveyors (VCIIs). The proposed APFs comprise 2 VCIIs cooperating with 3 resistors and 1 capacitor. The phase angle of the output relative to input signals can be tuned by the single external resistor. Different from previously related works, they use only VCII+ which can be easily realized and less complicated for both integrated circuit architecture and off-the-shelf design. In addition, a 450 mV 1.98 µW VCII based on bulk-driven quasi-floating-gate MOS transistor was developed to be used in this work to achieve ultra low-voltage and low-power consumption. The proposed APFs offer a phase shifting function over a wide range of operating frequency. Its output also provides an accurate sinusoidal signal. The testing results obtained from Cadence Virtuoso System Design Platform simulation are disclosed to investigate different behaviors of the proposed APFs. In addition, the experimental setup using commercially available integrated circuits is shown. From the both results, it is found that they are agreed well with the mentioned anticipations. An application of the proposed APFs in quadrature sinusoidal oscillator is also depicted, it enjoys independent controllability of oscillation condition and oscillation frequency for a wide range of operating frequency with a precise quadrature output signal.
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    VCII-Based Transimpedance-Mode All Pass Filter using Single Grounded Capacitor
    (2024-01-01)
    Theppota, Burin
    ;
    Jaikla, Winai
    ;
    Saksiri, Wiset
    ;
    Siripruchyanun, Montree
    This paper describes a first-order transimpedance-mode all-pass filter (APF) based on single grounded capacitor and second-generation voltage conveyors (VCIIs). The proposed APF comprises 3 VCIIs cooperating with 5 resistors and 1 grounded capacitor, it is consequently suitable to integrated circuit implementation. The phase angle of the output relative to input signals can be tuned by the external resistors. In addition, the amplitude of output voltage can be linearly controllable by a resistor. The output current can also be achieved to offer current-mode APF without changing circuit topology. The proposed APF offers a phase shifting function over a wide range of operating frequency. Its output also provides an accurate sinusoidal signal. The testing results obtained from PSpice simulation are disclosed to investigate different behaviors of the proposed APF. From the results, it is found that they are agreed well with the mentioned anticipations, where its total power consumption is about 1.02mW at ±1.2V supply voltages.
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    Transmission line model for an edge-coupled patch antenna
    (2008-01-01)
    Saksiri, Wiset
    ;
    Chongcheawchamnan, Mitchai
    ;
    Krairiksh, Monai
    In this paper, a simple transmission line model for an edge-coupled patch antenna is presented. The coupled section is modeled with a lump network which represents the mutual admittance between patches and from patch to ground. Theoretical analysis of two edge-coupled patch antenna models are compared by simulation and experiment in antennas designed to operate at the 2 GHz band. The proposed model predicts the return loss of the antenna accurately.
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    Lumped element model approach for the bandwidth enhancement of coupled microstrip antenna
    (2003-07-14)
    Saksiri, Wiset
    ;
    Krairiksh, Monai
    Microstrip antenna is suitable for mobile handsets due to its light weight and compactness. Its disadvantage of narrow bandwidth is necessary to be improved for modern wireless communication systems. This paper proposes a lump element model for the analysis of a coupled microstrip antenna and illustrates the appropriate coupling coefficient for bandwidth enhancement. This condition can be achieved by using serration of coupled microstrip antenna. Return loss of this antenna is analyzed in terms of serration and the obvious characteristics improvement can be observed. It is found to be useful for the practical wireless communication systems.