Tuntrakool, Sunti

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Tuntrakool, Sunti
Alternative Name
Tuntrakool, S.
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sunti.tu@kmitl.ac.th

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Now showing 1 - 7 of 7
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    A new quadrature sinusoidal oscillator for telecommunication system using VDDDAs
    (2016-03-22)
    Chaichana, Amornchai
    ;
    Jaikla, Winai
    ;
    Suwanjan, Peerawut
    ;
    Tuntrakool, Sunti
    A CMOS voltage differencing differential difference amplifiers (VDDDAs) based voltage-mode quadrature sinusoidal oscillator is proposed. The proposed oscillator is based on the two integrator loop configuration with amplifier wherein the frequency of oscillation (FO) is tuned by the time constant of two integrator and the condition of oscillation (CO) is tuned by gain of amplifier. It is constructed from two VDDDAs, two resistors, and two grounded capacitors. With this structure, it is attractive to develop in monolithic chip. The tuning of frequency of oscillation can be electronically done without affecting the condition of oscillation. Also, the condition of oscillation can be adjusted by external resistor without affecting to frequency of oscillation. The simulation results have been demonstrated and discussed using parameters of 0.18um TSMC CMOS technology and +0.9V power supply voltages.
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    Temperature Insensitive Current-Mode Four Quadrant Multiplier Using Single CFCTA
    (2017-02-09)
    Tuntrakool, Sunti
    ;
    Suwanjan, Peerawut
    ;
    Jaikla, Winai
    A four quadrant multiplier of two current input signals using active building block, namely current follower cascaded transconductance amplifier (CFCTA) is presented in this paper. The proposed multiplier consists of only single CFCTA without the use of any passive element. The presented circuit has low impedance at current input node and high impedance at current output node which is convenient for cascading in current mode circuit without the need of current buffer circuits. The output current can multiply two input currents with temperature insensitivity. Moreover, the magnitude of output current can be controlled electronically via DC bias current. With only single active building block, the presented multiplier is suitable for integrated circuit implementation for analog signal processing. Simulation results from a PSpice program are presented in order to demonstrate the multiplier proposed here.
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    Integer- And fractional-order VCO using non-inertial amplitude stabilization and modern active elements
    (2020-04-28)
    Sotner, Roman
    ;
    Petrzela, Jiri
    ;
    Jerabek, Jan
    ;
    Langhammer, Lukas
    ;
    Polak, Josef
    This paper introduces design of the linearly tunable quadrature voltage-controlled oscillator (VCO) using modern off-the-shelf active elements suitable for the design of electronically adjustable applications. The simplified topology was achieved using non-inertial stabilization of amplitude. It allows targeting adjustability of the oscillation frequency only into lossless integrator part of the topology. This arrangement simplifies the design and the tenability also. Derived symbolical expressions indicate that gain adjustment of used amplifiers (that are still in single path) does not influence amplitude and phase shift ratio of generated waveforms, which is a beneficial feature. The performances of the circuit are tested experimentally in band of units of MHz and results confirmed expected behavior. Initial study of the oscillator with fractional-order capacitors is presented and discussed. Results are supported by laboratory measurements.
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    Single DVCCTA based voltage-mode quadrature sinusoidal oscillator with electronic controllability
    (2014-01-01)
    Tuntrakool, Sunti
    ;
    Jaikla, Winai
    ;
    Suwanjan, Peerawut
    This paper presents simple voltage-mode quadrature sinusoidal oscillator. The proposed oscillator consists of one differential voltage current conveyor Tran conductance amplifier (DVCCTA), one electronic resistor (constructing from two NMOS transistors), and two grounded capacitors. The frequency of oscillation (FO) and condition of oscillation (CO) can be electronically tuned via external bias current which is easily controlled by microcontroller. The PSPICE simulation results using parameters of 0.25us TSMC CMOS technology are included and found that with 10MHz frequency of oscillation, the total harmonic distortions (THDs) for VO1 and VO2 are about 0.643% and 0.489%, respectively. The power consumption is nearly 3.1 mW at ±1.25V power supply voltages. With simple construction, the proposed oscillator is convenient to develop in monolithic chip.
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    Voltage Differencing Current Conveyor Differential Input Transconductance Amplifier: Novel Active Element and Its Resistorless Filtering Application
    (2019-10-01)
    Sotner, Roman
    ;
    Jerabek, Jan
    ;
    Langhammer, Lukas
    ;
    Petrzela, Jiri
    ;
    Jaikla, Winai
    This paper introduces novel modification of active element based on current conveyor transconductance amplifier core abbreviated as current controlled voltage differencing current conveyor differential input transconductance amplifier (CC-VDCCDITA). The active element is implemented by recently developed and manufactured IC modular device based on I3T25 0.35 μm ON Semiconductor CMOS process. Active element uses three internal active cells of this IC device for construction of the CC-VDCCDITA. An application example of proposed element in simple special resistor-less electronically adjustable biquadratic filter is shown. Brief comparison with state-of-the-art solutions indicates beneficial features of proposed solution. Simulation results in Cadence IC tool accompany precise laboratory experimental measurements with real prototype.
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    High input impedance voltage-mode universal filter and its modification as quadrature oscillator using VDDDAs
    (2017-05-01)
    Tuntrakool, Sunti
    ;
    Kumngern, Montree
    ;
    Sotner, Roman
    ;
    Herencsar, Norbert
    ;
    Suwanjan, Peerawut
    The second order universal voltage-mode filter using voltage differencing differential difference amplifiers (VDDDAs) has been proposed. It has high input impedance voltage-mode biquad filter with orthogonal tune of natural frequency and quality factor. The proposed filter simultaneously provides five filter responses: low-pass (LP), high-pass (HP), band-reject (BR), all-pass (AP) and band-pass (BP) in the same circuit topology. The natural frequency and quality factor can be tuned electronically and orthogonally dc bias current. The output impedance at output nodes HP, AP and BR has low impedance which can connect to other circuit without the use of voltage buffers. The proposed filter consists of three VDDDAs, one grounded resistor and two grounded capacitors. This makes the proposed filter suitable for integrated circuit development. With slightly modifying the proposed filter, the voltage-mode qudrature sinusoidal oscillator with low output impedance and independent control of condition of oscillation (CO) and frequency of oscillation (FO) has been achieved. The results shown in this paper are from PSPICE simulation and experiment to validate the proposed circuits.
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    Illuminance sensing in agriculture applications based on infra-red short-range compact transmitter using 0.35 μm CMOS active device
    (2020-01-01)
    Sotner, Roman
    ;
    Jerabek, Jan
    ;
    Polak, Ladislav
    ;
    Petrzela, Jiri
    ;
    Jaikla, Winai
    This paper introduces a novel electronic system for simplex low-bitrate infra-red (IR) communication applications. The transmitter is implemented completely by analog building blocks, formed with the help of a recently fabricated chip that includes active elements allowing various modular interconnections. For the design of this chip, the ON Semiconductor C035~0.35μm I3T25 technology was chosen due to the trade-off between cost, efficiency and obtainable parameters. The designed transmitter operates as a voltage-to-duty cycle converter, using pulse width modulation that causes ON/OFF keying of the carrier signal for infra-red (IR) diode. The duty cycle variable between 7% and 83% is modulated by the input voltage (in the range of ±0.8 V) of the transmitter. The use case of the proposed concept in the measurement of illuminance within the range of 30 lx and 550 lx is also presented. The quality of the transmission was evaluated as the error between the transmitted and received values of the duty cycle (kept mostly below 10 %). The maximal power consumption of the transmitter reaches 180 mW.
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