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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
;
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 balanced output CMOS OTA with wide linear current tunable range
(2011-09-01)
Kaewdang, Khanittha
;
Surakampontorn, Wanlop
A new CMOS-based balanced output operational transconductance amplifier (BOTA) with very wide linear current tunable range is proposed in this paper. The design technique is achieved by the combination of a fully differential transconductor and an electronically variable current gain stage. The transconductance gain of the proposed BOTA can be linearly tuned by an external bias current for more than 4 decades, with less than 4% nonlinearity for the linear input-voltage range of about 0.2 V<inf>peak</inf>. The OTA is designed in 0.5 μm AMIS technology. The performance of the proposed circuit is discussed and confirmed through application example and PSPICE simulation results. © 2010 Elsevier GmbH. All rights reserved.
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A novel widely linear current-tunable CMOS transconductor
(2009-12-01)
Kaewdang, Khanittha
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Surakampontorn, Wanlop
A CMOS-based linearly tunable transconductor is proposed in this paper. The realization technique is achieved by using a fully differential transconductor and a current variable gain stage, for a power supply of ±1.5V. Its transconductance gain can be linearly tuned by an external bias current for more than 4 decades. The transconductor cell is designed in 0.5μm AMIS technology. The performance of the proposed circuit is discussed and confirmed through PSPICE simulation results. ©2009 IEEE.
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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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A wide tunable range CMOS OTA
(2008-10-06)
Kaewdang, Khanittha
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Surakampontorn, Wanlop
A wide linear tunable range transconductor based on CMOS technology is proposed in this paper. The realization technique is achieved by squaring the transconductance gain (g<inf>m</inf>) of the CMOS OTA. Its g<inf>m</inf> can be linearly tuned by an external bias current for more than 3 decades (2uA-3mA), with less than 2% nonlinearity for the Input-voltage linear range of about 1Vp. The usefulness of the proposed linear tunable tranconductor is demonstrated through an application example, an electronically tunable biquad Alter. The performance of the proposed circuit is discussed and confirmed through PSPICE simulation results. © 2008 IEEE.
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On the realization of electronically current-tunable CMOS OTA
(2007-05-02)
Kaewdang, Khanittha
;
Surakampontorn, Wanlop
A CMOS operational transconductance amplifier (OTA) called as an EOTA, where its transconductance gain can be electronically and linearly tuned is proposed in this paper. The realization method is achieved by squaring the transconductance gain of the balanced CMOS OTA. The EOTA transconductance gain can be linearly tuned by an external bias current for three decades. The linear input-voltage range of about 1 Vp with less than 1% nonlinearity is obtained. The usefulness of the proposed EOTA is demonstrated through application example with a current multiplier. The performance of the proposed circuit is discussed and confirmed through PSPICE-simulation results. © 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 design of CMOS tunable current amplifiers
(2004-12-01)
Kaewdang, Khanittha
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Surakampontom, Wanlop
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Fujii, Nobuo
Two CMOS tunable current amplifiers are proposed in this paper. They are voltage-controlled current gain and current-controlled current gain. Both circuits are designed based on CMOS OTA which amplifiers are linearly tunable. The circuits achieve their linearity by squaring the nonlinear transconductance of the balanced CMOS OTA. The proposed voltage-controlled current amplifier can be linearly tuned by DC voltage. The amplifier's nonlinearity is less than 1% for the voltage control (V<inf>c</inf>) range from -2V to 2V. The current-controlled current amplifier can also have a linearly-tunable current gain by DC bias current over three decades (0.1-20) with an error less than 1.5%. The performances of the proposed circuit are discussed and confirmed through PSPICE simulation.
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A simple wide-band CMOS based true rms-to-dc converter
(2004-07-01)
Kaewdang, Khanittha
;
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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