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Author: search.filters.author.Buakaew, SeangraweeSubject: search.filters.subject.analog circuit

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    Boosting the Quality Factor of the Shadow Bandpass Filter
    (2022-09-30)
    Buakaew, Seangrawee
    ;
    Wongtaychatham, Chariya
    This paper proposes a new method to increase the quality factor of the shadow bandpass filter. The proposed circuit topology is simple, with the use of conventional biquad cell along with external amplifiers. The major advantageous feature is that the quality factor of the filter is boosted up whereas the gain of the external amplifier is significantly reduced. Moreover, the presented idea can be applied to the shadow filter in both current and voltage modes. The proposed scheme is justified via circuit performance. The performance is compared with the previous research works in the same arena. The results show that a feedback signal and a properly chosen gain incredibly boost up the quality factor of the shadow bandpass filter. Simulations by PSpice using 0.18-μm CMOS-level parameters confirm the validity of the proposed work.
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    Adjustable Quadrature Shadow Sinusoidal Oscillator
    (2022-01-01)
    Buakaew, Seangrawee
    ;
    Atiwongsangthong, Narin
    This article presents a shadow oscillator with quadrature-phase outputs. The proposed circuit employs the voltage differential transconductance amplifier (VDTA) and two grounded passive elements. The frequency of the oscillation, as well as the condition of oscillation, are accomplished through the tunning of the gains of the external amplifiers. Therefore, frequency adjustability can be performed without the effect on the biquad cell which is the main feature of the shadow oscillators. The results from the PSpice simulations employing the CMOS circuit level are included to verify the proposed quadrature shadow oscillator configurations.