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Author: search.filters.author.Kunto, Terdsak

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    Realization of tunable elliptic low-pass filter based on CCCIIs
    (2016-03-11)
    Kunto, Terdsak
    ;
    Prommee, Pipat
    This article presents a realization of electronically tunable current-mode Elliptic ladder low-pass filter using CCCIIs. The passive RLC ladder filters prototype and signal flow graph method (SFG) are employed for synthesis. The CCCII-based lossy, lossless integrators and current attenuator are required for the circuit realization. The proposed filter circuit can be electronically tuned between 1 kHz and 1 MHz through bias current from 0.05μA to 50μA. The proposed filter use ±1.5V power supply with 6 mW power consumption at 50 μA bias current. The proposed filter uses grounded capacitors without external resistors which is suitable for further integration. The total harmonic distortion (THD) of the low-pass filters is less than 0.5% over the operating frequency range. PSPICE simulation results are carried out, obtained by using BJT model parameter of HFA 3046, confirm the presented theory.
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    CMOS-based current-mode tunable ladder Elliptic low-pass filter
    (2015-10-09)
    Prommee, Pipat
    ;
    Kunto, Terdsak
    ;
    Somdunyakanok, Montri
    ;
    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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    OTA high pass filter-based multiphase sinusoidal oscillator
    (2015-10-09)
    Thongdit, Preecha
    ;
    Kunto, Terdsak
    ;
    Prommee, Pipat
    This paper proposes a new approach to implement a multiphase sinusoidal oscillator using loop-back of n-cascaded high-pass filters form. Two basic CMOS Multiple Outputs Operational Transconductance Amplifier (MOOTA) and grounded capacitors are constructed as a current-mode high-pass filter. Gain and frequency response of high-pass filter can be independently tuned through the particular bias current. It is, therefore, orthogonally of oscillation condition and frequency oscillation is obtained through bias currents of each OTA. Multiphase sinusoidal current output and voltage output can be obtained with equally space in phase of 360/n degree. Third-order high-pass filter has been raised to confirm the theoretical agreement. Low-harmonic distortion of achieved sinusoidal output less than 0.75% is obtained. The performances are carried out by PSpice for confirm its attractive characteristics.
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    Electronically tunable current-mode high-order ladder low-pass filters based on CMOS technology
    (2015-01-01)
    Kunto, Terdsak
    ;
    Prommee, Pipat
    ;
    Abuelma'atti, Muhammad Taher
    This paper describes the design of current mode low-pass ladder filters based on CMOS technology. The filters are derived from passive RLC ladder filter prototypes using new CMOS lossy and lossless integrators. The all-pole and Elliptic approximations are used in the proposed low-pass filter realizations. The proposed two types of filter can be electronically tuned between 10 kHz and 100 MHz through bias current from 0.03 μA to 300 μA. The proposed filters use 1.5 V power supply with 3 mW power consumption at 300 μA bias current. The proposed filters are resistorless, use grounded capacitors and are suitable for further integration. The total harmonic distortion (THD) of the low-pass filters is less than 1% over the operating frequency range. PSPICE simulation results, obtained by using TSMC 0.18μm technology, confirm the presented theory.