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Author: search.filters.author.Maneewan, SuwatSubject: search.filters.subject.VDTA

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    A voltage-mode first order allpass filter based on VDTA
    (2014-01-01)
    Maneewan, Suwat
    ;
    Udorn, Nawee
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    Duangmalai, Danupat
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    Silapan, Phamorn
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    Jaikla, Winai
    This article presents a new voltage-mode first order allpass filter (APF) employing voltage differencing transconductance amplifier (VDTA). The advantages of the circuit are that: the circuit description is very compact, consists of merely a VDTA and a capacitor: the phase shift can be electronically adjusted by current bias: it provides the lower THD of the output signal. Without any component matching conditions, the proposed circuit is very appropriate to further develop into an integrated circuit. Moreover, the proposed APF can provide the output current with high output impedance without modification of the circuit topology. The PSpice simulation results are depicted. The given results agree well with the theoretical anticipation. The maximum power consumption is 400μ W at ±1.25V power supplies. © 2014 Advances in electrical and electronic engineering.
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    High input impedance mixed-mode biquad filter with orthogonal tune of natural frequency and quality factor
    (2014-01-01)
    Chumwangwapee, Kanokrat
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    Jaikla, Winai
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    Sunthonkanokpong, Wisuit
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    Jaikhang, Wipobh
    ;
    Maneewan, Suwat
    This paper deals with a single-input multiple-output mixed-mode second-order filter providing two voltage-mode functions (low-pass and band-pass) and three transconductance-mode functions (low-pass, band-pass and band-reject) based on voltage differencing transconductance amplifier (VDTA). The quality factor and pole frequency can be electronically and orthogonally tuned via the bias current. The proposed circuit uses two VDTAs and two grounded capacitors without any external resistors, which is suitable to further develop into an integrated circuit. Moreover, the circuit possesses high input impedance, providing easy cascading. The PSPICE simulation results are included, verifying the key characteristics of the proposed filter. The given results agree well with the theoretical presumptions. © 2014 IEEE.
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    Simple quadrature sinusoidal oscillator with orthogonal control using sigle active element
    (2012-12-01)
    Pourak, Thanpong
    ;
    Suwanjan, Peerawut
    ;
    Jaikla, Winai
    ;
    Maneewan, Suwat
    The voltage-mode quadrature sinusoidal oscillator using single voltage differencing tranconductance amplifier (VDTA) and grounded elements is presented. The proposed oscillator can provide 2 sinusoidal output voltages with 90° phase difference. The condition of oscillation (CO) and frequency of oscillation can be electronically/orthogonally controlled by adjusting the bias current of the VDTA. The use of only grounded elements is ideal for integration. The PSpice simulation results are depicted. The given results agree well with the theoretical anticipation. © 2012 IEEE.