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Author: search.filters.author.Buakaew, SeangraweeSubject: search.filters.subject.VDTA

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    High Quality-Factor Shadow Bandpass Filters with Orthogonality to the Characteristic Frequency
    (2020-06-01)
    Buakaew, Seangrawee
    ;
    Narksarp, Wipavan
    ;
    Wongtaychatham, Chariya
    The paper proposes the topology and implementation of the shadow bandpass filter. The main advantage of this work is that the bandpass filter possesses the distinctively high-quality factor whereas the control of this quality factor is independent with the tunability of the characteristic frequency. The circuit configuration is realized and satisfactorily verified via PSpice simulation.
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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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    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.