Prommee, Pipat

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Prommee, Pipat
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Prommee, P.
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pipat.pr@kmitl.ac.th

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    A current-mode quadrature oscillator based on CC-CFAs
    (2009-10-26)
    Kumbun, Jongjarean
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    Silapan, Phamorn
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    Siripruchyanun, Montree
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    Prommee, Pipat
    This article presents a current-mode quadrature oscillator using current controlled current feedback amplifiers (CC-CFAs) as active elements. The proposed circuit is realized from a lossy integrator and a lossy differentiator. The oscillation condition and oscillation frequency can be orthogonally controlled via input bias currents. The circuit description is very simple, consisting of merely 2 CC-CFAs, one grounded and floating capacitors. Without any external resistors and using a few number of external passive components, the proposed circuit is then suitable for IC architecture. The proposed circuit, due to high output impedances, enabling easy cascading in current-mode signal processing. The PSPICE simulation results are depicted, and the given results agree well with the theoretical anticipation. The power consumption is approximately 327μW at ±1.5V supply voltages. ©2009 IEEE.
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    A versatile vector summation circuit
    (2006-12-01)
    Netbut, Chuachai
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    Kumngern, Montree
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    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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    Realization of OTA-C current-mode universal filter based on two type integrators loop
    (2007-12-01)
    Prommee, Pipat
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    Somdunyakanok, Montri
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    Angkeaw, Krit
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    Dejhan, Kobchai
    A universal current-mode active filter based on 2 types of integrator, lossy and lossless integrators, is presented. The biquadratic transfer function is obtained by the two integrators loop. The proposed circuit employs only 2 multiple output OTAs (MO-OTA) and 3 capacitors. The parameter Q<inf>P</inf> can be wide-range tuned independent from the ω<inf>P</inf> either changing of capacitor and transconductance gains. Moreover, the four different kind filter functions as lowpass, highpass, bandpass and band-reject response can be also obtained without changing circuit topology. The parameters ω<inf>p</inf> can be electronically tuned through adjusting the transconductance gains of the OTAs. The simulation results have been carried out by PSpice. © 2007 IEEE.
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    Universal filter and its oscillator modification employing only active components
    (2009-01-01)
    Prommee, Pipat
    ;
    Somdunyakanok, Montri
    ;
    Dejhan, Kobchai
    An active-only devices current-mode universal fIlter using the biquadratic transfer function is proposed. The proposed circuit is realized based on minimized active-only components count without external passive elements. The electronic resistors are used instead of 2 OTAs. The different kinds of fIlter function such as lowpass, highpass, bandpass and band-reject response can be obtained without changing circuit topology. A quadrature oscillator can also be easily modifIed without changing circuit topology. The proposed circuit is realized by using 4 MOS transistors, 3 OTAs, and 2 Opamps. The parameters ~ and Qp can be electronically tuned independently through adjusting the transconductance gains of the OTAs. The simulation results are given by PSpic.
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    Single low-supply and low-distortion CMOS Analog Multiplier
    (2005-12-01)
    Prommee, Pipat
    ;
    Somdunyakanok, Montri
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    Angkaew, Krit
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    Jodtang, Arkhom
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    Dejhan, Kobchai
    A single low-supply CMOS Analog Multiplier based upon ohmic region of MOS transistors is presented. This paper describes a method to force the drain-source voltage (V<inf>DS</inf>) of MOS transistors to operate in ohmic region. The achieved circuit can be used a single low-power supply. The complete circuit contains 20 transistors and 8 current sources using a low-power supply +1.5 volts. This circuit has high performance with very high-linearity and low-distortion. The achieved input dynamic range operation is ±400mV, the linearity error is smaller than 0.1% and total harmonic distortion is smaller than 0.25% for input range 800mVp-p. © 2005 IEEE.
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    A capacitor-grounded current-tunable current mode all-pass network
    (2004-12-01)
    Kumngern, Montree
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    Sampattavanich, Passaron
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    Prommee, Pipat
    ;
    Dejhan, Kobchai
    A first-order current-mode all-pass section (CM-APS) using two current-controlled conveyors (CCCII) and a grounded capacitor are presented. The current-mode first order section consists of one single-output CCCII, one dual-output CCCII and one grounded capacitor. The circuit operation in current mode; and it can be directly employed as a subsystem of monolithic circuit. PSpice simulation results are carried out in order to verify the theory. © 2004IEEE.
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    Current-mode active-only universal filter
    (2006-12-01)
    Prommee, Pipat
    ;
    Kumngern, Montree
    ;
    Dejhan, Kobchai
    A universal current-mode active-only filter using the biquadratic transfer function is proposed. The proposed circuit is realized by minimized active-only components count without external passive elements. The different kinds of filter function as low pass, highpass, bandpass and band-reject response can be obtained without changing circuit topology. The proposed circuit is realized by using MOS transistors, OTAs, and OPAMPs. The parameters ω<inf>P</inf> can be electronically tuned through adjusting the transconductance gains of the OTA and Q<inf>P</inf> can be tuned by changing of their components without effect to ω<inf>P</inf> . The simulation results are given by PSpice. ©2006 IEEE.
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    Single low-supply current-mode CMOS analog multiplier circuit
    (2006-12-01)
    Prommee, Pipat
    ;
    Somdunyakanok, Montri
    ;
    Kumngern, Montree
    ;
    Dejhan, Kobchai
    A simple structure of low-voltage current-mode CMOS analog multiplier circuit is presented. This multiplier circuit is based-upon quarter square algebraic identity technique by using CMOS technology. The transistors are operated in saturation region for different sub-circuits. The electronic resistor circuits are used as the input stage. The differential amplifiers are used for biased the squaring circuits. The current-mode operation can be obtained with a single supply, low-voltage, high-linearity and wide-bandwidth. This paper consists of 16 NMOSs with a 1.5 volts single supply. The achieved circuit performances have been carried out by PSpice. The input range is obtained more than ±100μA with linearity error less than 1%. The frequency response can be operated larger than 150 MHz. © 2006 IEEE.
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    CCCII-based multiphase sinusoidal oscillator employing high-pass sections
    (2009-10-22)
    Prommee, Pipat
    ;
    Somdunyakanok, Montri
    ;
    Angkeaw, Krit
    This paper proposes a new approach to implement a multiphase sinusoidal oscillator by using loop-back of n-cascaded high-pass sections form. Two CMOS Current-controlled Current Conveyors (CCCII) and a grounded capacitor are constructed as a current-mode high-pass section for each phase. The orthogonally of oscillate condition and frequency of oscillation are obtained with their electronically controllable through current biased of CCCII. Multiphase sinusoidal outputs can be obtained with equally spaced in phase, 360/n degree. Third-order oscillator is raised up to confirm the theoretical agreement. Low-harmonic distortion of achieved sinusoidal output obtains less than 0.9%. The performances are carried out by PSpice for confirm its characteristics. ©2009 IEEE.
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    CMOS wide-range four-quadrant analog multiplier circuit
    (2005-12-01)
    Prommee, Pipat
    ;
    Somdunyakanok, Montri
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    Poorahong, Kittipat
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    Phruksarojanakun, Phinat
    ;
    Dejhan, Kobchai
    A wide-range CMOS analog multiplier based-upon a quarter square algebraic identity technique is proposed. The transistors are operated in the both of saturation and ohmic regions. It consists of shunt-feedback buffer and active attenuator circuits that obtained to the voltage regulation circuits. This paper uses 16 transistors and 4 current sources with a ±1.5V power supply. The wide input dynamic range voltage can be achieved reaching the power supply. The bandwidth is rather than 141 MHz and total harmonic distortion is smaller than 0.7%. The results are carried out by PSpice simulation program. © 2005 IEEE.