Suwanjan, Peerawut
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Suwanjan, Peerawut
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peerawut.su@kmitl.ac.th
22 results
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Item type:Publication, Electronically tunable voltage-mode SIMO OTA-C universal biquad filter(2011-12-01); ; Dejhan, KobchaiThis paper presents a new voltage-mode biquad filter with single-input multiple-output (SIMO) based on single-ended operational transconductance amplifiers (OTAs) and grounded capacitors. The proposed filter can provide lowpass, bandpass, highpass, bandstop and allpass voltage characteristics. The natural frequency can also be tuned electronically by adjusting the transconductance values of OTAs. The filter still enjoys no requirement with the component choice conditions and no requirement with the inverting-type input signal to realize specific filtering functions, high input impedance, and low active and passive sensitivities. PSPICE simulation results are provided to demonstrate the theoretical analysis. © 2011 IEEE. - 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, Single VDDDA-Based Lossy Inductance Simulator for Application to Sinusoidal Oscillator(2023-01-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Design of electronically tunable first order allpass filter using OTAs with gain controllability(2013-12-31); ; Silapan, PhamornThis 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. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Temperature Insensitive Current-Mode Four Quadrant Multiplier Using Single CFCTA(2017-02-09); ; 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. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, New quadrature sinusoidal oscillator with amplitude controllability(2014-01-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Three-inputs single-output voltage-mode universal filter with orthogonal control using single commercially available IC(2017-07-02); ; In this study, a new electronically tunable voltage-mode second-order universal filter as a new application for commercially available IC named LT1228 from Linear Technology Inc is presented. The proposed filter with three-inputs and single output voltage uses single LT1228, two resistors and two capacitors, which is well suited for off-the-shelf implementation. The proposed filter can provide high pass (HP), low pass (LP), band pass (BP), band reject (BR) and all pass (AP) responses with electronic control of the quality factor (Q) and the natural frequency (ω0). The control of quality factor can be done without affecting natural frequency. The selection of filter response can be done without any critical passive component matching conditions and double gain amplifier circuit. A number of simulations based on PSPICE program are achieved in order to demonstrate the performance of the proposed filter. - 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, Single DVCCTA based voltage-mode quadrature sinusoidal oscillator with electronic controllability(2014-01-01); ; 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. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Transequatorial radio propagation monitoring(2005-12-01); According to error of satellite signals traveling through the ionosphere, it can be Impractical and receiver performance can be severely degraded. At times of high sunspot number, Transequatorial Propagation on Ionospheric scintillations are most likely to occur during solar maximum, particularly affecting equatorial and auroral regions. Although isolated efforts have been reported, systematic analyses of the effects on positioning systems have not been performed. Auroral disturbances affecting North- South gradients can lead to effects at mid-latitudes. This paper presents initial monitoring results of a study on transequatorial radio propagation. A state-of-the-art SAO explorer, which extracts scintillation parameters from radio frequencies measurements, is being used. © 2005 IEEE.