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Author: search.filters.author.Prasertsom, DanuchaSubject: search.filters.subject.Current-mode circuit

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    Simple current-mode square-rooting circuit with temperature compensation using only OTAs
    (2010-01-01)
    Tangsrirat, Worapong
    ;
    Prasertsom, Danucha
    ;
    Pukkalanun, Tattaya
    ;
    Surakampontorn, Wanlop
    A simple current-controlled current-mode square-rooting circuit with temperature compensation employing operational transconductance amplifi ers (OTAs) as active elements is proposed. It has been designed by using only four OTAs, without the employment of additional passive elements. The current gain of the proposed circuit can be electronically controlled, thanks to the tuning property of the OTA. Simulation and experimental results are obtained to verify the theoretical analysis of the proposed circuit technique.
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    Low-voltage digitally controlled current differencing buffered amplifier and its application
    (2009-04-03)
    Tangsrirat, Worapong
    ;
    Prasertsom, Danucha
    ;
    Surakampontorn, Wanlop
    In this paper, a design of a low-voltage digitally controlled current differencing buffered amplifier (DC-CDBA) is introduced. The realization scheme is through the cascade connection of a current differencing circuit, a current division network (CDN) and a buffered voltage amplifier. To achieve the digital control of the current gain of the circuit, a novel CDN is also proposed. The proposed DC-CDBA can operate with the low supply voltage of ± 1.25 V. PSPICE simulations using standard 0.5 - μ m CMOS process parameters are in agreement with the theory. An application example using the proposed DC-CDBAs as active elements in the realization of the digitally tuned current-mode universal filter is also included. © 2008 Elsevier GmbH. All rights reserved.
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    Temperature-insensitive current-mode square-rooting circuit using OTAs
    (2008-12-01)
    Prasertsom, Danucha
    ;
    Unhavanich, Sumalee
    ;
    Tangsrirat, Worapong
    A simple current-mode square-rooting circuit with temperature compensation employing operational transconductance amplifiers (OTAs) as active elements is proposed. It has been designed by using only four OTAs without the employment of additional passive elements. The current gain of the proposed circuit can be electronically controlled, thanks to the tunability property of the OTA. Simulation results are obtained to verify the theoretical analysis of the proposed circuit technique. © 2008 SICE.
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    Electronically tunable low-component-count current-mode biquadratic filter using dual-output current followers
    (2007-11-01)
    Tangsrirat, Worapong
    ;
    Prasertsom, Danucha
    In this paper, a realization of a current-controlled three-input single-output current-mode universal biquadratic filter using dual-output current followers (DO-CFs) as active components is described. Based on the use of the current-controlled conveyor working as the DO-CF, the proposed circuit employs only two DO-CFs and two grounded capacitors that provide the advantage of an electronic tuning capability and is of special interest from the IC fabrication point of view. By suitably selecting three input signals, the filter can realize all of the standard biquadratic filtering functions, i.e., lowpass, bandpass, highpass, bandstop and allpass, all at a high impedance output which enables easy cascading in the current-mode operation. The natural angular frequency (ω <inf>o</inf> ) and the bandwidth (BW) of the proposed circuit can be tuned independently and electronically over a wide range by adjusting the external bias currents. In addition, no critical component matching conditions are required for all the filter response realizations, and both active and passive sensitivities are low. PSPICE simulation results are used to confirm the characteristics of the proposed circuit. © 2006 Springer-Verlag.