Montri Somdunyakanok

King Mongkut's Institute of Technology Ladkrabang, Krung Thep, Bangkok, Thailand

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Publications (27)0.55 Total impact

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    Dataset: Paper50
    Pipat Prommee, Thanate Pattanatadapong, Montri Somdunyakanok
  • P. Prommee, M. Somdunyakanok
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    ABSTRACT: This paper describes the design of a current-mode multiphase sinusoidal oscillator (MSO) based on log-domain all-pass network. The first order all-pass filter circuit is realized by first order all-pass filter. In each block of all-pass filter includes ten bipolar transistors and a grounded capacitor. The simulation of three-phase sinusoidal signal generator is carried out by SPICE. The 2.5V power supply is used for achieving the frequency from 700Hz - 70MHz by adjusting the bias currents. For bias currents 100 μA, the frequency of the signal is obtained around 7MHz and total harmonic distortion is measured around 1.5%. The three signal outputs of the proposed MSO are equally spaced in phase and amplitude.
    Telecommunications and Signal Processing (TSP), 2012 35th International Conference on; 01/2012
  • Montree Kumngern, Montri Somdunyakanok
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    ABSTRACT: This paper presents a new current-controlled current-mode multifunction filter with three inputs and single output employing four translinear current conveyors (CCCIIs) and two grounded capacitors. By appropriately selecting the input terminals, the circuit can realize lowpass, bandpass, highpass, bandstop and allpass current responses without chaining the circuit topology. The filter also offers independent electronic control of the natural frequency and the quality factor. The characteristics of the proposed filter are simulated using PSPICE simulations to confirm the theory.
    01/2011;
  • Pipat Prommee, Montri Somdunyakanok
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    ABSTRACT: This paper presents design of an active building block for analog signal processing, named as current-controlled differential difference current conveyor (CCDDCC). Its parasitic resistances at X-terminal can be controlled by an input bias current. The proposed element is realized in a CMOS technology. It displays usability of the new active element, where the maximum bandwidth of voltage and current followers are around 1GHz, 100MHz, respectively. The THD is obtained around 0.8% within 0.6Vp–p input range. The power dissipation of a CCDDCC at 10μA biased current is obtained around 1.35mW with ±1.25V power supplies. In addition, grounded capacitor-based floating capacitance multiplier and current-mode (CM) multiple-input single output (MISO) second-order universal analog filters are included as the applications. For realization of a grounded capacitor-based floating capacitance multiplier, it employs three CCDDCCs and one grounded capacitor without resistor connections. The capacitance can be tuned electronically through the bias current. The filter offers the simultaneous realization five type standard filter responses. The quality factor and the frequency response parameters can be independently tuned. The non-ideal effects of the developed structures are examined. SPICE simulation results of proposed CCDDCC and its applications are also presented.
    Aeu-international Journal of Electronics and Communications - AEU-INT J ELECTRON COMMUN. 01/2011; 65(1):1-8.
  • Pipat Prommee, Thanate Pattanatadapong, Montri Somdunyakanok
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    ABSTRACT: itl.ac.th Abstract- A realization of current-mode log-domain all-pass filter is proposed. The circuit is a direct realization of a first­ order differential equation for obtaining the low-pass filter. The proposed all-pass filter is realized by using log-domain low-pass filter. The log-domain all-pass filters is realized by using only 10 NPN transistors and a grounded capacitor for achieving low-power and fast response. The frequency response and stage gain can be electronically tuned through bias currents. An application of proposed log-domain all-pass filter is a quadrature sinusoidal oscillator. The proposed oscillator is obtained by cascading two all-pass filters loop. A validated BJT model which is used in SPICE simulation operated from a single power supply as low as 2V. The proposed circuit is also suitable for high-frequency applications. SPICE simulation results confirm the theoretical
    Midwest Symposium on Circuits and Systems 01/2011;
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    Montri Somdunyakanok, Krit Angkeaw, Pipat Prommee
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    ABSTRACT: This paper proposes a new floating capacitance multiplier using three Current Control Differential Difference Current Conveyors (CCDDCCs) with CMOS technology and one grounded capacitor. The circuit can be electronically tuned through bias currents of CCDDCC without external resistor connections and temperature effects do not affected to the capacitance characteristic. The realization is suitable for further integration. The third-order elliptic LPF is included as an application. The simulations results of proposed capacitance multiplier and its applications are carried out by PSpice that agrees well with the theoretical expectations.
    01/2011;
  • Pipat Prommeei, Nattawit Prapakorni, Montri Somdunyakanok
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    ABSTRACT: A log-domain current-mode quadrature sinusoidal oscillator (QSO) based on low-pass (LP) and high-pass (HP) filters is presented. The log-domain QSO is realized by using only 18 NPN transistors and 2 grounded capacitors for achieving low-power and fast response. The proposed oscillator uses a cascade connecting the LP and HP which can be electronically tuned through bias current. Frequency of oscillation can be tuned over a wide-range with a low-power supply as 2V which is suitable for Ie production. The power consumption is obtained around 5.5mW at 100pA of bias current. The oscillation frequency is controlled over four decades offrequency. The total harmonic distortion of QSO at 10.63MHz is obtained around 1.25%. The proposed circuit is suitable for high-frequency applications. PSpice simulation confirms the theoretical results.
    Midwest Symposium on Circuits and Systems 01/2011;
  • Pipat Prommee, Montri Somdunyakanok, Krit Angkeaw
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    ABSTRACT: A log-domain current-mode quadrature sinusoidal oscillator based on all-pass filter and lossless integrator is presented. The oscillator is realized by a first-order differential equation for obtaining all pass filter and lossless integrator. The proposed oscillator can be electronically tuned by adjusting bias currents. The proposed oscillator contains 18 NPN transistors, 2 grounded capacitors and 11 bias currents for achieving low-power and fast response. A validated BJT model is used in SPICE simulation operated from a single power supply as low as 2.5V. The oscillation frequency is controlled over four decades of frequency. The total harmonic distortion of signal output is obtained around 0.55%. The oscillation frequency can be operated more than 100MHz which enables fully integrated in telecommunication systems and suitable for high-frequency applications. SPICE simulation results are included.
    01/2011;
  • Pipat Prommee, Montri Somdunyakanok, Krit Angkeaw, Kobchai Dejhan
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    ABSTRACT: This paper describes the design of a current-mode universal filter based on log-domain filtering concept. The circuit is a direct realization of a first-order differential equation for obtaining the two integrators loop structure. Lossless integrators are realized by log-domain lossy integrators. The proposed filter comprises only two grounded capacitors and sixteen transistors. Frequency response of the proposed filter can be instantaneously controlled over a very wide frequency range by controlling current. Quality factor is independently controlled by another current. It can be seen that the proposed circuit suites for high-frequency applications. A validated BJT model that used in simulation is operated by a single power supply as low as 2.5V. The wide-range frequency response is controlled over five decades of current controlled.
    International Symposium on Circuits and Systems (ISCAS 2010), May 30 - June 2, 2010, Paris, France; 01/2010
  • Pipat Prommee, Montri Somdunyakanok, Sompongse Toomsawasdi
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    ABSTRACT: This paper presents design of an active building block for analog signal processing, named as current-controlled differential difference current conveyor (CCDDCC). Its parasitic resistances at X-terminal can be controlled by an input bias current. The proposed element is realized in a CMOS technology. It displays usability of the new active element, where the maximum bandwidth of voltage and current followers are around 1GHz, 100MHz, respectively. The THD is obtained around 0.8% within 0.6Vp-p input range. The power dissipation of a CCDDCC at 10μA biased current is obtained around 1.35mW with ±1.25V power supplies. In addition, current-mode multiple-input single output (MISO) second-order universal analog filter is included as the applications. The filter offers the realization of simultaneous five type standard filter responses. The quality factor and the frequency response parameters can be independently tuned. SPICE simulation results of proposed CCDDCC and its applications are also presented.
    International Symposium on Circuits and Systems (ISCAS 2010), May 30 - June 2, 2010, Paris, France; 01/2010
  • Montri Somdunyakanok, Montree Kumngern
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    ABSTRACT: This paper presents a practical realization of a recently basic building block for analog signal processing, namely differential difference current conveyor using the commercially available integrated circuits. The commercially available integrated circuits LM13600 and AD844 are used to perform as a differential difference amplifier and a current conveyor, respectively. The characteristics of the proposed circuit are simulated using PSPICE to confirm theory.
    01/2010;
  • Pipat Prommee, Montri Somdunyakanok
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    ABSTRACT: This paper describes the design of a multiphase sinusoidal oscillator (MSO) based on log-domain filtering concept. The circuit is a direct realization of a first-order differential equation for obtaining the inverting lossy integrators. Each integrator comprises only a grounded capacitor and four transistors per phase. The proposed MSO can be instantaneously controlled over a very wide frequency range by controlling a current for oscillation frequency and oscillation condition which are indicated proposed MSO suitability in high-frequency communications. The power consumption is obtained around 5.5 mW at 100 μA of bias current based on 2.5 V single power supply. The oscillation frequency is controlled over four decades of frequency. The total harmonic distortion of three-phases (11.5 MHz) is obtained around 2.4%.
    01/2010;
  • P. Prommee, M. Somdunyakanok, K. Angkeaw
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    ABSTRACT: 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.
    Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology, 2009. ECTI-CON 2009. 6th International Conference on; 06/2009
  • P. Prommee, M. Somdunyakanok, K. Dejhan
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    ABSTRACT: 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 omega<sub>P</sub> and Q<sub>P</sub> can be electronically tuned independently through adjusting the transconductance gains of the OTAs. The simulation results are given by PSpice.
    Intelligent Signal Processing and Communications Systems, 2008. ISPACS 2008. International Symposium on; 03/2009
  • Pipat Prommee, Krit Angkeaw, Montri Somdunyakanok, Kobchai Dejhan
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    ABSTRACT: CMOS-based near zero-offset multiple inputs maximum circuit and minimum circuits are proposed. The analog signal building blocks including shunt-feedback buffer, voltage-subtraction circuits and current mirrors are deployed for obtained the good performances. This achieved circuit is a simply scheme and able to work with low-power supplies. The input range is obtained around ±600mV within ±1.5V power supplies. Near zero-offset and low-output impedance are provided by proposed circuit. The delay of output is less than 5ns for THD less than 1% and frequency response up to 500MHz. Half-wave, full-wave rectifiers and 4 bits linear combination Digital-to-Analog Converter (DAC) are raised up to confirm the realistic applications. All performances including the DC-characteristic, frequency response, high-frequency wave output are simulated by PSpice.
    Analog Integrated Circuits and Signal Processing 01/2009; 61(1):93-105. · 0.55 Impact Factor
  • M. Somdunyakanok, T. Pattanathadapong, P. Prommee
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    ABSTRACT: This paper proposes an accurate electronically tunable current-mirror circuit based on translinear type-A (polarities alternative) topology. This circuit is realized by only 6 transistors with BJT technology. A shunt-feedback buffer principle is used in order to regulate its emitter voltage of translinear part. For current mirror behavior, output and input currents are identical with a small error. Current-gain can be obtained by adjusting the ratio of the 2 particular current sources. This proposed circuit is using only 6 transistors for the simple structure. The analysis of input, output resistance and current-gain are depicted. An extra transistor is added for maintained the transfer minimum error which is also proposed. The constant bandwidth more than 40 MHz of various current-gains can be obtained. From current output mathematic function, several applications such as current multiplier, current divider and tunable current mirror are certainly performed. Other applications are raised to confirm realistic applicable including squaring and square-rooting circuits. All characteristics and performances are carried out by PSpice for confirm their well operations.
    Communications and Information Technologies, 2008. ISCIT 2008. International Symposium on; 11/2008
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    M. Kumngern, M. Somdunyakanok, P. Prommee
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    ABSTRACT: A new voltage-mode three inputs and one output universal biquadratic filter with high-input impedance employing six simple operational transconductance amplifiers (OTAs) and two grounded capacitors is presented. The proposed circuit offers the following features: realization of all the standard filter functions, that is, highpass, bandpass, lowpass, bandstop, and allpass filters; electronically tunable of the angular frequency through adjusting the bias currents/voltages of OTAs; no requirements for component matching conditions; high-input impedance good for cascadability for the voltage-mode circuits; the use of only grounded capacitors and require no resistor; low active and passive sensitivities. PSPICE simulation results that confirm the theoretical predictions are given.
    Communications and Information Technologies, 2008. ISCIT 2008. International Symposium on; 11/2008
  • Source
    M. Somdunyakanok, Krit Angkeaw, Pipat Prommee, M. Kumngern
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    ABSTRACT: An universal current-mode active-only filter using the biquadratic transfer function is proposed. The proposed circuit is realized by lossy and lossless integrators with minimize active components count without external passive elements. The different kinds of filter functions as lowpass, highpass, bandpass and band-reject response can be obtained without changing circuit topology. The proposed circuit implementation is realized by using MOS transistors, CMOS MO-OTAs, and CMOS OPAMPs. The parameters wp can be tuned electronically through adjusting the transconductance gains of the OTA or electronic resistor power supplies. The simulation results are given by PSpice.
    01/2008;
  • P. Prommee, M. Somdunyakanok, K. Angkeaw, K. Dejhan
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    ABSTRACT: 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 Qp can be wide-range tuned independent from the omega<sub>p</sub> 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 omega<sub>p</sub> can be electronically tuned through adjusting the transconductance gains of the OTAs. The simulation results have been carried out by P Spice.
    Communications and Information Technologies, 2007. ISCIT '07. International Symposium on; 11/2007
  • Pipat Prommee, Montri Somdunyakanok, Kobchai Dejhan
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    ABSTRACT: An OTA-C current-mode universal filter with independent tunable-Q realized by band-reject function is proposed. The proposed circuit employs OTAs and grounded capacitors. The parameter Q<sub>P</sub> can be tuned independently from omega<sub>P</sub>. However, the other different kinds filter function as low-pass, high-pass, band-pass and band-reject response can be also obtained without changing circuit topology. The parameters omega<sub>P</sub> and Q<sub>p</sub> can be electronically tuned through adjusting the transconductance gains of the OTAs. Moreover, the parameter Q<sub>p</sub> can be also tuned by changing component manually without effect to the omega<sub>P</sub> The simulation results have been carried out by PSpice
    Circuits and Systems, 2006. APCCAS 2006. IEEE Asia Pacific Conference on; 01/2007