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Access type: UnknownSubject: search.filters.subject.Current differencing buffered amplifier

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    Single-resistance-controlled quadrature oscillator using current differencing buffered amplifiers
    (2008-01-01)
    Tangsrirat, W.
    ;
    Prasertsom, D.
    ;
    Piyatat, T.
    ;
    Surakampontorn, W.
    A single-resistance-controlled quadrature oscillator circuit using current differencing buffered amplifiers (CDBAs) as active components is proposed. The proposed circuit is realised through the employment of two CDBAs, three resistors and two grounded capacitors. Outputs of two sinusoidal with 90 phase difference are available. The oscillation condition and the oscillation frequency of the proposed quadrature oscillator can be controlled independently by a single resistor. In comparison with the previously reported circuits, the proposed configuration considerably reduces the number of passive elements.
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    Low-voltage NMOS-based current differencing buffered amplifier and its application to current-mode ladder filter design
    (2006-11-01)
    Tangsrirat, W.
    ;
    Klahan, K.
    ;
    Dumawipata, T.
    ;
    Surakampontorn, W.
    An integratable circuit technique to realize a low-voltage current differencing buffered amplifier (CDBA) is introduced. The realization scheme is through the modification of a low-input resistance CCII+ and the proposed CDBA can operate with the minimum supply voltage of ±1.25∈V. In order that the signal path consists of only NMOS transistors, a negative current mirror using NMOS transistors is employed. With standard 0.5∈μm CMOS process parameters, PSPICE simulation results show that the proposed CDBA provides the terminal resistance of , , and the -3∈dB bandwidth of about 500∈MHz. Application examples employing the proposed CDBA as active elements in the leapfrog simulation of current-mode ladder filters are also included.
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    Realization of leapfrog filters using current differential buffered amplifiers
    (2003-01-01)
    Tangsrirat, Worapong
    ;
    Surakampontorn, Wanlop
    ;
    Fujii, Nobuo
    In this paper, is shown an approach to realize leapfrog structures obtained from proto-type passive RLC ladder filters using current differencing buffered amplifiers (CDBA) as active elements. The use of the CDBA's provides advantages that the realization procedure is simplified and the number of active components required is reduced. The approach is quite suitable for the realization of band-pass ladder filters, which generally requires a complicated structure to simulate LC series and/or parallel resonant branches by the conventional opamp-based leapfrog filters. A simple circuit configuration of the CDBA suitable for high frequency and low power supply voltage applications is also presented. As design examples, a fifth-order Butterworth low-pass ladder filter and a sixth-order Chebyshev bandpass ladder filter are designed. The effectiveness and the correctness of the proposed approach and the characteristics of the proposed filters are verified and examined through computer simulation.