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Subject: search.filters.subject.CFCTA

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    New realization of single CFCTA-based voltage-mode multifunction filter
    (2018-06-08)
    Chanapromma, Chaiyan
    ;
    Jaikla, Winai
    ;
    Chaichana, Amornchai
    The realization of voltage-mode second-order multifunction filter using current follower cascaded transconductance amplifier (CFCTA) is presented in this contribution. The proposed circuit has three voltage input nodes and a single voltage output node. Its natural frequency and quality factor are electronically adjusted. Also, the control of the quality factor is done without affecting the natural frequency. Five filtering functions, low-pass filter (LPF), high-pass filter (HPF), band-pass filter (BPF), band-reject filter (BRF) and all-pass filter (APF), are obtained with the same circuit topology. The selection of each filter response meets the requirement of no active and passive element matching conditions. The PSpice simulation results of all five filtering functions along are included to verify the theoretical analysis.
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    Electronically tunable versatile current-mode MISO universal filter including minimum component count circuits
    (2014-01-01)
    Chaichana, Amornchai
    ;
    Kumngern, Montree
    ;
    Jaikla, Winai
    An analog second order current-mode filter is described in this paper. The proposed filter uses only a single active building block, namely current following cascaded transconductance amplifier with two grounded capacitors which is attractive for monolithic chip implementation. The circuit has four inputs and single output currents. Five standard functions, namely low-pass, high-pass, band-pass, band-reject and all-pass functions, are given. The natural pole frequency and quality factor can be tuned electronically via the input bias current. The inverting-type input current signal is not required for realization of all-pass function. High output impedance is achieved which is convenient to cascade in current-mode circuit. The PSPICE simulation results are depicted. The given results agree well with the theoretical anticipation. © 2014 IEEE.
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    Electronically tunable current-mode quadrature oscillator derived from first-order allpass filter
    (2014-01-01)
    Chaichana, Amornchia
    ;
    Jaikla, Winai
    In this study, an electronic controllability current-mode quadrature oscillator based on first-order all pass filter employing current follower cascaded Tran conductance amplifier (CFCTA) is presented. The proposed oscillator uses two CFCTAs, two electronic resistors and two grounded capacitor, which is easier for monolithic IC implementation. The condition of oscillation (CO) and frequency of oscillation are electronically and independently controlled which is well suited to use in modern electronic devices controlled by microprocessor. Moreover, the oscillator possesses high output impedances and thus it enables simple current-mode cascading. The PSPICE simulation results are included, verifying the workability of the proposed current-mode oscillator. The given results agree well with the theoretical anticipation.
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