Kumngern, Montree

Preferred name

Kumngern, Montree

Alternative Name

KUMNGERN, Montree

Kumngern, M.

Main Affiliation

School of Engineering

montree.ku@kmitl.ac.th

Now showing 1 - 10 of 47

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Electronically tunable multiphase sinusoidal oscillator using translinear current conveyors
(2010-11-01)
Kumngern, Montree
;
Chanwutitum, Jirasak
;
Dejhan, Kobchai
A new electronically tunable current-mode multiphase sinusoidal oscillator based on translinear current conveyors is presented. The proposed oscillator circuit, which employs only one translinear current conveyor and one grounded capacitor for each phase, can generate arbitrary N output current equal-amplitude signals that are equally spaced in phase (N being even or odd), all at high output impedance terminals. The frequency of oscillation and the condition of oscillation can be controlled electronically and independently through the bias current of the translinear current conveyor. The proposed structure also has simple circuitry, low-component count, and is highly suitable for integrated circuit implementation. The theoretical results were verified by PSPICE simulation. In addition, the modification of the N sinusoidal oscillators to construct a programmable multiphase oscillator is also discussed. © 2010 Springer Science+Business Media, LLC.
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High frequency and high precision CMOS half-wave rectifier
(2010-10-01)
Kumngern, Montree
;
Knobnob, Boonying
;
Dejhan, Kobchai
In this paper, a new high frequency and high precision half-wave rectifier circuit which is very suitable for CMOS technology implementation is presented. The system comprises a voltage to current converter, a dual output precision current-mode half-wave rectifier, and two current to voltage converters. An input voltage signal is converted into a current signal by using a current conveyor and a MOS resistor. The current signal is rectified using a dual output class-AB precision rectifier cell and then converted into two output voltages by using grounded MOS resistors. This class-AB current-mode precision rectifier is employed for providing high frequency performance. Simulated rectifier results based-on a 0.5 μm CMOS technology with ±1.2 V supply voltage demonstrates very high operating frequency, very precise rectification and good temperature stability. © Springer Science+Business Media, LLC 2010. © Springer Science+Business Media, LLC 2010.
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Electronically tunable current-mode quadrature oscillator using current differencing transconductance amplifiers
(2009-12-01)
Kumngern, Montree
;
Dejhan, Kobchai
A new electronically tunable single-element-controlled current-mode quadrature oscillator circuit using current differencing transconductance amplifiers (CDTAs) is presented. The proposed oscillator is consisted of two CDTAs, two grounded capacitors and one grounded resistor, which is beneficial to monolithic integrated circuit implementation. The oscillation condition and oscillation frequency of the circuit are independently controllable. Also, the oscillation frequency can be controlled by a bias current of CDTA. The realized of the circuit provides four quadrature current outputs at high output impedance nodes. PSPICE simulation results that confirm the theoretical predictions are given. © 2009 IEEE.
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A versatile vector summation circuit
(2006-12-01)
Netbut, Chuachai
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Kumngern, Montree
;
Prommee, Pipat
;
Dejhan, Kobchai
A versatile vector summation circuit is presented. It is based on CMOS dual translinear loops as operate in class AB and current mirrors, which leads to the input signal can be voltage and/or current into a single circuit without changing the circuit configuration. The circuit exhibits wide input range, low power consumption and good temperature stability. Simulation and experimental results verifying theoretical analyses are given. © 2006 IEEE.
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Electronically tunable voltage-mode SIMO OTA-C universal biquad filter
(2011-12-01)
Kumngern, Montree
;
Suwanjan, Peerawut
;
Dejhan, Kobchai
This 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.
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Wide-band CMOS precision rectifier circuit
(2008-12-01)
Kumngern, Montree
;
Lerkvaranyu, Somkiat
;
Dejhan, Kobchai
A wide-band precision CMOS rectifier, which is very suitable for integrated circuit implementation, is presented. The proposed circuit consists of a voltage-to-current converter, two precision rectifiers and four current-to-voltage converters that performs positive half-wave, negative half-wave, positive full-wave and a negative full-wave rectifications into a single circuit. The precision current-mode rectifier with operating in class-AB is employed to provide the high-frequency capability of the circuit. The circuit exhibits a very versatility, high operating frequency and good temperature stability The proposed configuration is very suitable for integrated circuit implementation both CMOS and bipolar technologies. The simulation results in CMOS technology demonstrate the performance of the proposed circuit. © 2008 IEEE.
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Electronically tunable voltage-Mode all-pass filter using simple CMOS OTAs
(2008-12-01)
Kumngern, Montree
;
Chanwutitum, Jirasak
;
Dejhan, Kobchai
A new high input impedance electronically tunable voltage-mode first-order all-pass filter using three simple CMOS operational transconductance amplifiers (OTAs) and one grounded capacitor is presented. The corner frequency can be controlled electronically by adjusting the bias currents of OTAs. Critical component matching conditions are not required in the design. The use of a grounded capacitor and without resistor makes the proposed circuits ideal for integrated circuit implementation. The characteristics of the proposed circuit are simulated using PSPICE to verify the theory. © 2008 IEEE.
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Electronically tunable voltage-mode universal filter with single-input five-output using simple OTAs
(2013-08-01)
Kumngern, Montree
;
Suwanjan, Peerawut
;
Dejhan, Kobchai
This article presents a new electronically tunable voltage-mode universal biquadratic filter with single-input five-output using simple operational transconductance amplifiers (OTAs) and grounded capacitors. The proposed configuration provides low-pass, band-pass, high-pass, band-stop and all-pass voltage responses at a high-impedance input terminal that enables easy cascading in voltage-mode. The natural frequency and the quality factor can be set orthogonally by adjusting the circuit components. The natural frequency can also be controlled electronically by adjusting the bias currents of the OTAs. For realising all the five standard filtering functions, no critical-matching conditions are imposed and all the incremental parameter sensitivities are low. Experimental and simulation results that confirm the theoretical predictions are given. © 2013 Copyright Taylor and Francis Group, LLC.
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New current-controlled current-mode multifunction filter using translinear current conveyors
(2008-12-01)
Kumngern, Montree
;
Sra-ium, Napat
;
Dejhan, Kobchai
A new current-mode universal biquadratic filter with two inputs and two outputs employing only two translinear current conveyors with controlled gain and two grounded capacitors is proposed. The proposed circuit offers the following features: realization of lowpass, bandpass, highpass, bandstop and allpass current responses from the same configuration, no requirements for component-matching conditions, independent current control of the natural frequency and the quality factor, low active and passive sensitivities, minimum active and passive components, high impedance output. The characteristics of the proposed circuit are simulated using PSPICE to confirm the theory. © 2008 IEEE.
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New electronically tunable current-mode universal biquad filter using translinear current conveyors
(2010-05-01)
Kumngern, Montree
;
Jongchanachavawat, Wirote
;
Dejhan, Kobchai
In this study, a new electronically tunable current-mode universal filter with two inputs and two outputs employing one translinear current conveyor, one translinear current conveyor with controlled current gain and two grounded capacitors is presented. The proposed circuit offers the following attractive features: realisation of low-pass, band-pass, high-pass, band-stop and all-pass current responses from the same configuration; employment of the minimum active and passive components; no requirement of component matching conditions; independent current-control of the parameters natural frequency (wo) and quality factor (Q); low active and passive sensitivities; and high impedance output. The characteristics of the proposed circuit are simulated using PSPICE to confirm the theory. © 2010 Taylor & Francis.

Kumngern, Montree

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