Jaikla, Winai

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Jaikla, Winai
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Jaikla, W.
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winai.ja@kmitl.ac.th

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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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    Exponentially tunable voltage controlled quadrature oscillator
    (2017-10-19)
    Sotner, Roman
    ;
    Jerabek, Jan
    ;
    Petrzela, Jiri
    ;
    Domansky, Ondrej
    ;
    Jaikla, Winai
    This paper deals with appropriate method of tunability extension in quadrature oscillators. Exponential dependence of frequency of oscillations on DC control voltage is created in lossless integrators by utilization of two exponentially controlled variable gain amplifiers and diamond transistors. Proposed solution maintains all beneficial features (especially independent levels of output waveforms on tuning process) of the oscillator concept employing two lossless integrators in the single loop and electronically controllable negative resistor serving for adjusting of condition of oscillations. PSpice verifications based on simulations of macromodels of used active devices confirmed doubled tunability range in comparison to standard linear control of frequency obtained for the same change of DC driving voltage.
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    Universal Filter Using Single Commercially Available IC: LT1228
    (2017-02-09)
    Siripongdee, Surapong
    ;
    Jaikla, Winai
    In electrical and electronic engineering, the filter is very importance circuit. A voltage-mode three inputs single output second-order multifunction filter is presented in this paper. The proposed filter is based on RLC parallel circuit. The main active element is the commercially available IC from Linear Technology Inc, LT1228. The filter consists of single LT1228, single resistor and two capacitors. Five output second-order filter responses, namely band-pass (BP), band-stop (BS), high-pass (HP), low-pass (LP) and all-pass (AP) functions are achieved. Each output response can be selected without component matching condition and the requirement of double gain amplifier. The quality factor and natural frequency can be electronically controlled. PSpice simulation results suing macro model of LT1228 are in close agreement with the theory.
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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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    Voltage-Mode Biquad Multifunction Filter Using VCIIs
    (2022-01-01)
    Pitaksuttayaprot, Koson
    ;
    Ritnathikul, Somkid
    ;
    Jaikla, Winai
    This paper describes a three-input, single-output, second-order filter with five responses, low-pass, high-pass, band-pass, band-reject, and all-pass functions, based on second-generation voltage conveyor (VCII). Both the quality factor and the pole frequency can be adjusted orthogonally. The proposed circuit is comprised of three VIIs, two capacitors, and six resistors. To obtain five filtering responses, the input signal applied into the input voltage nodes does not have to be doubled for the filter. Each filtering biquad function can be chosen by digitally selecting the appropriate input signals to input nodes of the filter. The output voltage node of the proposed multifunction filter is low impedance. The PSPICE application was used to design and simulate the filter. The simulation results from PSPICE are presented to validate the functionality of the presented versatile biquad filter. The simulation results coincide with the theoretical prediction very well.
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    Electronically Adjustable Voltage-mode First-order Allpass Filter Using Single Commercially Available IC
    (2019-01-01)
    Chaichana, Amornchai
    ;
    Siripongdee, Surapong
    ;
    Jaikla, Winai
    In this design, the use of single commercially available integrated circuit (IC), LT1228 from Linear Technology Corporation, to implement the first order allpass filter is presented. The passband voltage gain of the presented first allpass filter (APF) is unit and constant throughout the operation frequency, while the phase response is electronically tuned by changing the external DC bias current. With this property, the proposed first order filter can be used as phase shifter with microcontroller controllability. Tuning phase property is not required any matching condition. The proposed phase shifter consists of one LT1228, one capacitor and two resistors which is attractive for off the shelf implementation. Moreover, the impedance at output voltage node is exhibit low which can connect to other circuit without the requirement of external voltage buffer. The expected performances of the proposed circuit are proved by Pspice simulation using macro model parameters. Also, the quadrature sinusoidal oscillator which is designed from the connecting of the proposed filter and integrator is chosen as application example.
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    Single VDDDA-Based Lossy Inductance Simulator for Application to Sinusoidal Oscillator
    (2023-01-01)
    Jaikla, Winai
    ;
    Siripongdee, Surapong
    ;
    Sotner, Roman
    ;
    Suwanjan, Peerawut
    This work presents the design of a new grounded lossy inductance simulator. The proposed circuit emulates an inductor in parallel with a negative resistor, making it applicable to the design of a sinusoidal oscillator. The proposed simulator comprises a voltage differencing differential difference amplifier (VDDDA), a resistor, and a grounded capacitor. The proposed active inductor necessitates no essential matching criteria for passive elements. The equivalent inductance and negative resistance can be controlled electronically. Moreover, the parallel RLC and negative resistance configuration-based sinusoidal oscillator is designed as an example of its application. The oscillation frequency and condition are adjusted orthogonally. The performance of the proposed simulator circuit and the sinusoidal oscillator is evaluated using Pspice simulation and experimentation with VDDDA built from ICs AD830 and LM13700. The simulation and experimental results validate the behavior of the theory.
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    Single active element based electronically controllable grounded inductance simulator
    (2013-12-01)
    Siriphot, David
    ;
    Maneewan, Suwat
    ;
    Jaikla, Winai
    This article presents grounded inductance simulator using single current controlled current follower transconductance amplifier (CCCFTA) as active element. The simulated inductance value can be controlled electronically by adjusting the bias current of the CCCFTA. The grounded inductance simulator comprises one CCCFTA and one grounded capacitor without any external resistors and component matching requirements. The circuit performances are depicted through PSpice simulations, they show good agreement to theoretical anticipation. An application as second-order low-pass filter is included to confirm the usability of proposed circuit. It is very suitable to realize the proposed filter in monolithic chip to use in biomedical signal processing. © 2013 IEEE.
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    Design of electronically tunable first order allpass filter using OTAs with gain controllability
    (2013-12-31)
    Prommas, Thawach
    ;
    Jaikla, Winai
    ;
    Suwanjan, Peerawut
    ;
    Silapan, Phamorn
    This paper presents current-mode first-order allpass filter using three operational transconductance amplifiers (OTAs) and grounded capacitor. The use of grounded capacitor makes the circuit more suitable for integrated circuit implementation. The current gain and phase shift can be independently controlled with electronic method. The circuit has high output impedance which enables easy cascading in the current mode circuits. The PSpice simulation results are depicted. The given results agree well with the theoretical anticipation. © 2013 IEEE.
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    Multifunction Voltage-Mode Filter Using Single Voltage Differencing Differential Difference Amplifier
    (2017-02-09)
    Chaichana, Amornchai
    ;
    Sangyaem, Surasak
    ;
    Jaikla, Winai
    In this paper, a voltage mode multifunction filter based on single voltage differencing differential difference amplifier (VDDDA) is presented. The proposed filter with three input voltages and single output voltage is constructed with single VDDDA, two capacitors and two resistors. Its quality factor can be adjusted without affecting natural frequency. Also, the natural frequency can be electronically tuned via adjusting of bias current. The filter can offer five output responses, high-pas (HP), band-pass (BP), band-reject (BR), low-pass (LP) and all-Ass (AP) functions in the same circuit topology. The output response can be selected by choosing the suitable input voltage without the component matching condition and the requirement of additional double gain voltage amplifier. PSpice simulation results to confirm an operation of the proposed filter correspond to the theory.