Chaichana, Amornchai
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Preferred name
Chaichana, Amornchai
Alternative Name
Chaichana, Amonchai
Chaichana, Amornchia
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Email
amornchai.ch@kmitl.ac.th
14 results
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Item type:Publication, Current-mode MISO filter using CCCDTAs and grounded capacitors(2015-07-01); ; This paper presents the current-mode multi-input single-output (MISO) biquadratic filter using current-controlled current differencing tranconductance amplifier (CCCDTA) as an active building block. The proposed circuit comprises three CCCDTAs and two grounded capacitors performing completely standard functions: low-pass, high-pass, band-pass, bandreject and all-pass functions and does not require double input current signals as well as inverting input currents. The pole frequency and quality factor of the proposed circuit can be adjusted electronically/independently via dc bias currents. In addition, the filter circuit has low-input and high-output impedance which facilitates easy connecting for current-mode circuit. The proposed circuit uses all grounded capacitors which is very suitable to further develop into an integrated circuit and without requiring any matching condition. Moreover, the active and passive sensitivities are low. The PSPICE simulation results are included to show the workability of the proposed circuit. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Electronically tunable current-mode quadrature oscillator derived from first-order allpass filter(2014-01-01); 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. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A new quadrature sinusoidal oscillator for telecommunication system using VDDDAs(2016-03-22); ; ; 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. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Electronically Adjustable Voltage-mode First-order Allpass Filter Using Single Commercially Available IC(2019-01-01); ; 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. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Multifunction Voltage-Mode Filter Using Single Voltage Differencing Differential Difference Amplifier(2017-02-09); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Simple realization of quadrature sinusoidal oscillator with independent control(2017-07-02); In this paper, a new sinusoidal oscillator is proposed. As a interesting feature, the proposed oscillator provides two sinusoidal voltage waveforms with 90° degree phase difference without the requirement of additional phase shifter circuit. The proposed circuit employs only a voltage differencing current conveyor (VDCC), three resistors and two grounded capacitors. The frequency of oscillation (FO) and condition of oscillation (CO) can be independently controlled. Also, the tuning of frequency of oscillation can be done electronically. The use of single active is highly attractive from integration point of view. PSPICE simulations using 0.18μm CMOS parameters and supply voltage of ±0.9V demonstrates a precise operation. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Design of Electronically Controllable Quadrature Sinusoidal Oscillator with Linear Control of Frequency(2019-12-01); ; ; Sotner, RomanIn this paper, the design of sinusoidal oscillator which generates two output voltages with 90° degree phase difference is presented. The design procedure is started from the function block diagram to proposed oscillator using commercially available ICs. The proposed oscillator is constructed from three OTAs, one voltage summing circuit, one grounded resistor and two grounded capacitors. The frequency of the generated sinusoidal waveform is electronically and linearly controlled without disturbing the condition for oscillating of the system. With this feature, the proposed oscillator is used to generates the frequency modulation (FM) signal. The magnitude of the quadrature voltage waveform is equal during adjusting the generated frequency. A Pspice simulation and experiment are done to verify the performance of the proposed circuit. The macro models of available ICs, LM13700 and AD830 are employed for simulation. The simulation and experimental results confirm theory well as expected. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, MIMO-type current-mode multifunction biquadratic filter using a MCDTA(2013-01-01); This paper presents a current-mode multifunction biquadratic filter with multiple inputs and multiple outputs using a single modified current differencing transconductance amplifier and two grounded capacitors. The proposed circuit provides following advantages: low number of active and passive elements; realization of lowpass, bandpass, highpass, bandstop and allpass filtering functions; employment of grounded capacitors which is suitable for integrated circuit implementation; no requirement with the component-matching conditions and the inverting-type input signals; electronic control of the natural frequency; low active and passive sensitivities. The PSPICE simulation using standard CMOS technology is performed to confirm the workability of the proposed universal filter. © 2013 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Control system technology of higher educational community traffic in Bangkok metropolitan(2017-07-01); The traffic network designed for the communities plan around higher education service areas in Bangkok and vicinity aimed to 1) study the traffic flow in the communities plan around the higher education service areas in Bangkok and vicinity, 2) study the appropriate information used to plan the traffic routes for the particular community's plan, and 3) provide control system of guideline for information needed for the traffic routes planning for the certain community's plan. The data was collected from 400 samples who were regular commuters in the certain area around the higher education service areas in Bangkok and vicinity through sets of questionnaires. Then, the data was analyzed based on the research methodology. According to the result, the researcher found that the city commuting network affecting the accessibility of each area should provide sufficient convenience for the commuting demand and it should be able to connect to other networks as well. Moreover, the traffic of the communities around the higher education service areas in Bangkok and vicinity must be easily understood, accessible, and each route must be used equally. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Amplitude controllable current-mode first order allpass filter including minimum component count circuits(2015-10-09); ;