Chaichana, Amornchai

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Chaichana, Amornchai
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Chaichana, Amonchai
Chaichana, Amornchia
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amornchai.ch@kmitl.ac.th

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    Synthesis of electronically tunable multifunction biquad filter using voltage differencing differential input buffered amplifiers
    (2025-02-01)
    Bunrueangsak, Sirigul
    ;
    Jaikla, Winai
    ;
    Chaichana, Amornchai
    ;
    Supavarasuwat, Piya
    ;
    Siripongdee, Surapong
    Biquad filters are commonly used in analog circuits for various purposes in signal processing and communication applications. We synthesize an analog active biquad filter with five types of voltage-mode filtering functions. The filter is synthesized using a parallel passive resistor-inductor-capacitor (RLC) network and unity-gain voltage differencing amplifier. A voltage differencing differential input buffered amplifier (VD-DIBA) is the main active component, and the biquad filter has a three-input single-output (TISO) topology. By replacing the passive inductor and resistor with VD-DIBA-based inductance and resistance simulators with a subtractor, the TISO voltage-mode versatile filter is obtained from two VD-DIBAs, one resistor, and two capacitors connected to the ground. The proposed filter can provide five types of voltage-mode filtering functions: inverting bandpass and lowpass responses as well as noninverting band-stop, high-pass, and all-pass responses. The all-pass filter requires no additional active components. The three input voltage nodes have high impedance, and a low-impedance output voltage node facilitates cascade connections without using additional voltage buffers. In addition, the natural frequency and quality factor can be electronically tuned. The quality factor is controlled without disturbing the passband gain and natural frequency. The proposed filter is simulated and verified experimentally in the Personal Simulation Program with Integrated Circuit Emphasis (PSPICE) and through laboratory tests employing VD-DIBAs implemented using commercially available components.
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    Item type:Publication,
    Amplitude controllable current-mode first order allpass filter including minimum component count circuits
    (2015-10-09)
    Chaichana, Amornchai
    ;
    Kumngern, Montree
    ;
    Siripruchyanun, Montree
    ;
    Jaikla, Winai
    This paper presents a current-mode first order allpass filter based on current follower cascaded transconductance (CFCTA). The phase shifted angle and amplitude of output currents can be electronically and independently tuned via the bias current. The proposed circuit uses only one CFCTA and one grounded capacitor and one electronic resistor, which is definitely suitable to further develop into an integrated circuit. It can provide both non-inverting and inverting output currents. Moreover, the circuit possesses low input and high output impedance, providing easy cascading in current-mode circuit. The PSPICE simulation results based on 0.25μm TSMC CMOS parameters are included, verifying the key characteristics of the presented filter. The given results agree well with the theoretical presumptions. The power consumption is about 5.5mW.
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    Item type:Publication,
    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.