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Author: search.filters.author.Somdunyakanok, Montri

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    CMOS-based current-mode tunable ladder Elliptic low-pass filter
    (2015-10-09)
    Prommee, Pipat
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    Kunto, Terdsak
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    Somdunyakanok, Montri
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    Prommee, Tanakrit
    This paper presents a tunable CMOS-based third-order low-pass filter that can be operated in high frequency. The proposed low pass filter is designed based on Elliptic Ladder low-pass filter prototype. The proposed filter structure is constructed by using two lossy integrators and a lossless integrator. The proposed filter comprises only 18 transistors. The frequency responses of low-pass filter can be electronically tuned between 10kHz and 100MHz through bias current from 0.01 μA to 100 μA. The circuit used 1.5 V power supply with 3mW power consumption at 100 μA bias current. Using of the grounded capacitors which is suitable for further integration. THD of low-pass filter can be obtained less than 1% along the operating frequencies. PSPICE simulation results are carried out to confirm the theory by using TSMC 0.18μm technology.
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    Log-domain all-pass based multiphase sinusoidal oscillator
    (2012-10-05)
    Prommee, Pipat
    ;
    Somdunyakanok, Montri
    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. © 2012 IEEE.
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    Log-domain quadrature sinusoidal oscillator based on lossless integrator and all-pass filter
    (2011-12-01)
    Prommee, Pipat
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    Somdunyakanok, Montri
    ;
    Angkeaw, Krit
    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. © 2011 IEEE.
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    Three-input single-output current-mode multifunction filter using CCCIIs
    (2011-12-01)
    Kumngern, Montree
    ;
    Somdunyakanok, Montri
    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. © 2011 IEEE.
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    Floating-capacitance multiplier based on CCDDCCs and its application
    (2011-12-01)
    Somdunyakanok, Montri
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    Angkeaw, Krit
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    Prommee, Pipat
    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. © 2011 IEEE.
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    Log-domain all-pass filter and its application to quadrature sinusoidal oscillator
    (2011-10-13)
    Prommee, Pipat
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    Pattanatadapong, Thanate
    ;
    Somdunyakanok, Montri
    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 results. © 2011 IEEE.
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    Quadrature sinusoidal oscillator based on log-domain high-pass and low-pass filters
    (2011-10-13)
    Prommee, Pipat
    ;
    Prapakorn, Nattawit
    ;
    Somdunyakanok, Montri
    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 IC production. The power consumption is obtained around 5.5mW at 100μA of bias current. The oscillation frequency is controlled over four decades of frequency. 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. © 2011 IEEE.
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    CMOS-based current-controlled DDCC and its applications to capacitance multiplier and universal filter
    (2011-01-01)
    Prommee, Pipat
    ;
    Somdunyakanok, Montri
    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 1 GHz, 100 MHz, respectively. The THD is obtained around 0.8% within 0.6 Vpp input range. The power dissipation of a CCDDCC at 10μA biased current is obtained around 1.35 mW 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. © 2009 Elsevier GmbH. All rights reserved.
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    CMOS-based current-controlled DDCC and its applications
    (2010-08-31)
    Prommee, Pipat
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    Somdunyakanok, Montri
    ;
    Toomsawasdi, Sompongse
    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 0.6Vpp 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. ©2010 IEEE.
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    Tunable current-mode log-domain universal filter
    (2010-08-31)
    Prommee, Pipat
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    Somdunyakanok, Montri
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    Angkeaw, Krit
    ;
    Dejhan, Kobchai
    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. ©2010 IEEE.