Roongmuanpha, Natchanai

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Roongmuanpha, Natchanai
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Email
natchanai.ro@kmitl.ac.th

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    Item type:Publication,
    Cascadable First-Order and Second-Order Inverse Filters Based on Second-Generation Voltage Conveyors
    (2025-02-01)
    Roongmuanpha, Natchanai
    ;
    Likhitkitwoerakul, Nutcha
    ;
    Pukkalanun, Tattaya
    ;
    Faseehuddin, Mohammad
    ;
    Tangsrirat, Worapong
    This study introduces four novel configurations of first-order and second-order multifunction inverse filters in both voltage-mode (VM) and current-mode (CM) using second-generation voltage conveyors (VCIIs). The first-order VM and CM inverse filters utilize only three passive components together with one VCII for VM and two VCIIs for CM realizations, which can provide lowpass and highpass inverse filter responses. The latter, second-order VM and CM multifunction inverse filters, can be constructed using the corresponding first-order inverse filters as their core circuits. These filters offer all the basic inverse filter functions, including lowpass, bandpass, and highpass inverse responses with all gains obtained from the same design. All the inverse filter realizations are cascadable. No component matching requirements are necessary for all filter responses. The non-ideal effects of the VCII on the performance of the proposed inverse filters are thoroughly examined. To prove the feasibility of the designs, the PSPICE program performed several simulations, utilizing model parameters of 0.18 µm CMOS technology. Some testing experiments were conducted using the commercially available IC-type AD844s for evaluating the practical performance of the designed inverse filters.
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    Two-Quadrant Current-Mode Logarithmic and Anti-logarithmic Amplifiers with Temperature Compensation
    (2025-09-01)
    Pukkalanun, Tattaya
    ;
    Roongmuanpha, Natchanai
    ;
    Tangsrirat, Worapong
    ;
    Suesut, Taweepol
    This paper proposes circuit topologies for realizing two-quadrant current-mode logarithmic and anti logarithmic amplifier configurations with temperature compensation. The design approach employs the translinear approach to generate the output currents that directly correspond to the absolute values of the logarithmic and anti logarithmic functions. The proposed circuits can operate at a low-level supply voltage of 2V with both input and output current signals. A detailed examination of the non-ideal circuit performance has also been considered. To validate their functionality and illustrate their superior thermal stability, the developed circuits have been simulated. All simulations were conducted via PSPICE for a real bipolar transistor model of the HFA3096 technology.
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    LOW-VOLTAGE TEMPERATURE-INSENSITIVE LOGARITHMIC AND EXPONENTIAL FUNCTION CURRENT GENERATORS USING ONLY NPN TRANSISTORS
    (2025-01-31)
    Pukkalanun, Tattaya
    ;
    Satansup, Jetsdaporn
    ;
    Maneerat, Sutassa
    ;
    Tangsrirat, Worapong
    ;
    Roongmuanpha, Natchanai
    The continuing reduction of supply voltage for reliable operation of analog integrated circuits is widely recognized. Analog circuits must adhere to this trend. As a result, researchers are currently developing low-voltage analog circuit methodologies. Current-mode signal processing circuits are examples of these concepts. Therefore, the objective of this work is to present circuit realizations of low-voltage current-mode logarithmic and exponential function generators with temperature compensation. Both the input and output signals operate in current mode. The design approach utilizes the current-mode translinear technique to produce the output currents that exhibit a directly proportionality to the absolute values of the logarithmic and exponential functions. By simply adjusting the external bias currents, one can electronically tune the output currents and transfer current gains for both proposed circuits. The proposed circuits utilize only npn bipolar transistors and can operate with low-level supply voltages of ±1 V, which are appropriate for low-power, high-frequency applications. Nonideality performance considerations are also discussed in detail. In order to verify the operational function of the circuits and illustrate their superior thermal stability, the PSPICE simulation has been performed using real transistor models provided for the HFA3096 mixed bipolar array technology. The simulation findings illustrate that the proposed logarithmic and exponential amplifier circuits can compensate for temperature variations, as evidenced by the good stability of their output currents over a temperature range of –40 °C to 100 °C.