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Author: search.filters.author.Prasertsom, Danucha

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    Digitally programmable current amplifier
    (2012-12-01)
    Prasertsom, Danucha
    ;
    Photsathian, Thongchai
    ;
    Tangsrirat, Worapong
    In this paper, a the digitally programmable current amplifier (DP-CA) for NMOS integrated circuit implementation is presented. To provide precise digital control of the gain characteristic, the proposed DP-CA comprises current proportional gain blocks that can be digitally controlled. The proposed DP-CA can be operated from a low power supply of ±1.25V. As an application example of the proposed circuit, the digitally programmable current-mode first-order allpass filter is described. Simulation results using 0.35-μm TSMC CMOS process parameters are also included. © 2012 IEEE.
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    Current gain controlled CFTA and Its application to resistorless quadrature oscillator
    (2012-10-02)
    Prasertsom, Danucha
    ;
    Tangsrirat, Worapong
    This paper presents the concept of the current follower transconductance amplifier (CFTA) with current gain controllable. The newly modified element is a combination of the current follower, the variable gain current mirror, and the balance output transconductance amplifier. The advantage of the proposed element is that the current transfer characteristics (i <inf>z</inf>/i <inf>f</inf> and i <inf>x</inf>/i <inf>z</inf>) can be electronically tuned by means of external bias currents. As application example, the resistorless realization of current-mode quadrature oscillator based on the proposed current controlled gain CFTA element is also presented. PSPICE simulation results of the proposed circuit and its application are given to confirm the theoretical analysis. © 2012 IEEE.
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    CDBA-based sinusoidal quadrature oscillator with current controlled amplitude
    (2010-12-01)
    Prasertsom, Danucha
    ;
    Tangsrirat, Worapong
    This paper describes a sinusoidal quadrature oscillator circuit using current differencing buffered amplifiers (CDBAs), that features a single-resistance-controlled frequency and current amplitude control. The proposed circuit contains two CDBAs, three resistors, and two grounded capacitors. The oscillation condition (OC) and the oscillation frequency (ω<inf>0</inf>) of the circuit are independently controlled by a single resistor, whereas the oscillation amplitude is electronically controlled by an external DC current. Outputs of two sinusoidal voltages are shifted by 90°. The validity of the proposed circuit has been verified by hardware circuit tests using AD844 based CDBA. ©2010 IEEE.
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    High-output-impedance current-mode electronically tunable universal filter using single CFTA
    (2010-12-01)
    Sirirat, Jamaree
    ;
    Prasertsom, Danucha
    ;
    Tangsrirat, Worapong
    This paper presents a canonical current-mode biquad filter with three inputs and one output. The presented filter employs a single current follower transconductance amplifier (CFTA) and a minimum of passive components, i.e., one resistor and two grounded capacitors. It is capable of generating all the five standard biquadratic filtering functions and suitable for current-mode cascading by possessing high-output impedance. Also, the proposed filter can be tuned electronically by an external bias current of the CFTA. The circuit is analyzed for the non-idealities of the used CFTA and possesses attractive low sensitivity performance. PSPICE simulation results are found to be in good agreement with the presented theory. ©2010 IEEE.
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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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    CMOS digitally controlled current follower and its application
    (2009-12-01)
    Prasertsom, Danucha
    ;
    Tangsrirat, Worapong
    A realization of the CMOS digitally controlled current follower (DC-CF) suitable for low-voltage high-frequency application is proposed. To achieve very low input resistance, it is realized using a modification of a low-input resistance stage as an input stage. To achieve the precise digital control of the current gain, the current division technique is used. The proposed DC-CF can operate with low voltage supplies of ±1.5 V, and is designed with 0.5- μm CMOS SCN05H process. As an application, the digitally programmable current-mode universal filter using the proposed DC-CF is given. Simulation results are also included.
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    Current tunable current-mode biquadratic filter using dual-output current followers
    (2009-12-01)
    Bunruang, Kritsada
    ;
    Prasertsom, Danucha
    ;
    Pukkalanun, Tattaya
    ;
    Tangsrirat, Worapong
    This paper describes a current-mode multifunction filter with a minimum number of active and passive elements using dual-output current followers (DO-CFs) as active elements. By based on the dual-output current-controlled current conveyor (DO-CCCII)-based current followers, the proposed filter consists of only two DO-CFs and two grounded capacitor, without an external passive resistor requirement. The filter can realize all the standard biquadratic functions without changing the circuit configuration. Moreover, its natural angular frequency and bandwidth is controllable independently and electronically by adjusting an external bias current, and its active and passive sensitivities are low.
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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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    Low-voltage digitally controlled current differencing buffered amplifier
    (2008-12-01)
    Prasertsom, Danucha
    ;
    Tangsrirat, Worapong
    ;
    Surakampontorn, Wanlop
    A low-voltage digitally controlled current differencing buffered amplifier (DC-CDBA) is proposed. 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 ±1.25V. PSPICE simulations using standard 0.5μ CMOS process parameters are in agreement with the theory. © 2008 IEEE.