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A novel current-mode temperature-insensitive APF using a single CCCII+2 with grounded capacitor
(2016-01-01)
Kaewdang, Khanittha
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Kumwachara, Kiattisak
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Surakampontorn, Wanlop
A novel first-order all-pass filter (APF) using a single positive second-generation current conveyor of current gain equal to 2 (named as CCII+2), one grounded capacitor and one resistor is proposed. From the proposed CCII+2 based filter, by replacing the CCII+2 and the resistor with a positive second-generation current-controlled conveyor of current gain equal to 2 (named as CCCII+2), a new filter which requires only a single CCCII+2 and one grounded capacitor is achieved. In order to operate in current-mode with temperature insensitive, a temperature compensation technique for the CCCII is also proposed. The experimental and PSPICE simulation results found in a good agreement with theoretical analysis are included.
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A translinear-based true RMS-to-DC converter using only npn BJTs
(2009-06-01)
Kaewdang, Khanittha
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Kumwachara, Kiattisak
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Surakampontorn, Wanlop
A true rms-to-dc converter based on the explicit computation technique is proposed in this paper. Since the scheme utilizes translinear principle circuits to realize current-mode squarer, averaging and square root circuits, only npn bipolar junction transistors are required. The conversion circuit has wide-band frequency response and can be operated with single supply voltage at 2 V. PSPICE simulation and experimental results show good agreement with the theoretical predictions. © 2008 Elsevier GmbH. All rights reserved.
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Full-wave rectifiers based on operational transconductance amplifiers
(2007-03-01)
Jongkunstidchai, Chaiwat
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Fongsamut, Chalermpan
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Kumwachara, Kiattisak
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Surakampontorn, Wanlop
The implementation of full-wave rectifiers using operational transconductance amplifiers (OTAs) as only main active circuit elements is presented in this paper. The proposed scheme makes use of the characteristic of the differential amplifier inside the OTA and avoids the use of diodes. The typical problems of the OTA circuit, the input voltage swing limitation and the temperature dependence of the OTA transconductance gain, have been improved. Simulation and experimental results demonstrate the performance of the proposed rectifier are included. © 2006 Elsevier GmbH. All rights reserved.
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Electronically tunable floating CMOS resistor using OTA
(2005-12-01)
Kaewdang, Khanittha
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Kumwachara, Kiattisak
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Surakampontorn, Wanlop
A new CMOS OTA-based circuit is proposed to realize electronically tunable positive and negative floating resistors. The circuit employs two balanced OTAs and one fully differential OTA. The value of realized resistance can be linearly controlled by an external DC bias current over the range of more than 3 decades. The performances of the proposed circuit are discussed and confirmed through PSPICE simulation. © 2005 IEEE.
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A realization of simple current-mode CMOS based true RMS-to-dc converter
(2004-12-01)
Kaewdang, Khanittha
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Kumwachara, Kiattisak
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Surakampontorn, Wanlop
A simple circuit technique for the realization of an integrable current-mode CMOS true rms-to-dc converter is proposed. The realization scheme is based on the implicit computation method by makes use of the characteristic of a CMOS squaring circuit. Since the bias current of the circuit is provided by the I<inf>RMS</inf>, the conversion circuit consumes very low power. The performance of the circuit is studied through spectre in Cadence simulation results and experimental results. © 2004 IEEE.
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A compounded second-generation current conveyor using only NMOS transistors
(2004-09-27)
Pienchob, Patra
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Kumwachara, Kiattisak
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Surakampontorn, Wanlop
In this paper, A CMOS compounded Second-Generation Current Conveyor using only N-Channel MOSFET is introduced. The input stage of the presented circuit consists of Differential amplifier circuit and Current follower circuit and the output stage is Cascode current mirror. This structure provides the high impedance at port Y, Z + and Z -, and a low impedance at port X. Futhermore, using Differential amplifier circuit and Current follower circuit as a voltage to current converter the circuit gives low voltage offset. The performance of the proposed circuit is studied through the PSPICE simulations.
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A simple wide-band CMOS based true rms-to-dc converter
(2004-07-01)
Kaewdang, Khanittha
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Kumwachara, Kiattisak
;
Surakampontorn, Wanlop
A simple integrable circuit technique for the realization of a wide bandwidth current-mode CMOS true rms-to-dc converter is proposed. The realization scheme is based on the implicit computation method that makes use of the characteristic of a CMOS squaring circuit, where the transistors are biased in their saturation regions. The conversion circuit consumes very low power due to the bias current of the circuit provided by the root-mean-square current I<inf>RMS</inf>. The performance of the proposed circuit is studied through PSPICE simulation and experimental results.
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An integrable temperature-insensitive gm-RC quadrature oscillator
(2003-09-01)
Kumwachara, Kiattisak
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Surakampontorn, Wanlop
A novel gm-RC quadrature oscillator using operational transconductance amplifiers (OTAs) and grounded passive elements is proposed. The circuit provides two quadrature outputs of equal magnitude and the oscillation frequency is insensitive to temperature. The oscillation frequency can be linearly and electronically controlled without affecting the condition of oscillation. The active ω<inf>0</inf>-sensitivity has been shown to be small. Experimental and simulation results that demonstrate the performance of the proposed oscillator are also included.
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Low power dissipation CMOS output driver circuits
(2000-12-01)
Parnklang, Jirawath
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Kumwachara, Kiattisak
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Kongtanasunthorn, Prapan
The CMOS current-controlled output driver circuits, which are suitable for the low voltage supply integrated circuits, are presented in this title. The circuit consists of the negative and positive current mirror and the fundamental CMOS inverter circuits. This current mirror bias circuit can limit current in the transition region, that techniques is taking advantage for low-power operation. The experimental results show are shown which use the lowest possible supply voltage and low current can reduce power consumption in CMOS digital circuits.
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Low-voltage current mode power factor function generator
(2000-01-01)
Kumwachara, Kiattisak
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Fujii, Nobuo
This paper proposes a realization of power factor function generator having an arbitrary base and power factor which are determined by the ratios of the currents provided from outside of the circuit. The circuit characteristics do not depend on any transistor parameters, temperature, and other environmental conditions. The circuit operation is based on current mode that has a capability of low power supply voltage operation below than 2.0V. SPICE simulation has been carried out using 0.7 μm BiCMOS parameters and shows quite good transfer characteristics.

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