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Access type: UnknownSubject: search.filters.subject.Phase shifter

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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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    Improvement of transmission line circuit on lossy substrate with application on phase shifter design
    (2019-03-01)
    Pakasiri, Chatrpol
    ;
    Kongchayasukwat, Thitipun
    Lumped transmission line circuit design on lossy substrate is studied in this paper. Conventional single section lumped transmission line cannot perform well on lossy substrate as its electrical length gets longer. Multi-section transmission lines can be used to improve transmission line properties in this case. Phase shifter circuits are designed with a large electrical length transmission line. By using a multi-section transmission line, the resulting transmission line properties are better than those of single section transmission line.
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    Electronically adjustable phase shifter using OTAs
    (2010-12-01)
    Songsuwankit, Kanoknuch
    ;
    Petchmaneelumka, Wandee
    ;
    Riewruja, Vanchai
    First-order phase shifter using operational transconductance amplifiers (OTAs) as active elements is presented in this paper. The corner frequency of the proposed phase shifter can be adjusted by electronic means. The purpose of this paper is emphasized on simple configuration and low cost. The phase response between input and output signals against the operating frequency is varied from 180 to 0 degrees of phase lead. The principle of the proposed circuit is confirmed by simulation and experimental results. To verify the proposed circuit performance, the sinusoidal oscillator is provided for circuit application. ©ICROS.