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Author: search.filters.author.Pawarangkoon, Prajuab

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    A Nanopower EEG Low-Pass Filter Using Current-Sharing Vertical Differential Pairs
    (2025-01-01)
    Pawarangkoon, Prajuab
    ;
    Ahmad, Rafidah
    ;
    Abdullah Zawawi, Ruhaifi
    ;
    Abd Manaf, Asrulnizam
    ;
    Surakampontorn, Wanlop
    A follower-based g<inf>m</inf> - C low-pass filter that employs CMOS vertical source-couple-pair (VSCP) transconductors is proposed for practical use in EEG acquisition systems. The VSCP transconductor operates as a g<inf>m</inf> cell with current sharing and linearity enhancement features. It is applied in the first- and second-order g<inf>m</inf> - C sections cascaded to form a third-order low-pass filter targeting a 150-Hz bandwidth. To mitigate the effects of biasing current source mismatch, dynamic element matching (DEM) is optionally applied to the relevant biasing current source pairs, resulting in second harmonic distortion (HD2) and noise suppression. Implemented in a 0.18-µm process, the proposed filter consumes 16.3-nW power from a 1.2-V supply. Thanks to the DEM and VSCPs, the filter achieves a 150-mV<inf>P</inf> linear input range [measured at 1% total harmonic distortion (THD)], whereas the input-referred noise of 43 µV<inf>rms</inf> is obtained leading to a filter dynamic range (DR) of 65.15 dB. Overall performance comparisons with other recent nanopower filters indicate that the figure of merit (FoM) of this proposed filter is comparable, while the linear input range is larger.
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    A 38.4 nW, 1.2 V, 250-Hz, 2nd-Order gm - C LPF With Degenerative SCP Transconductors Achieving 800-mVPP Input Range and 82.1- μVrms IRN for ECG Acquisition
    (2025-01-01)
    Thanapitak, Surachoke
    ;
    Pawarangkoon, Prajuab
    ;
    Surakampontorn, Wanlop
    ;
    Ahmad, Rafidah
    ;
    Abdullah Zawawi, Ruhaifi
    In this brief, a 2{^{\text {nd} -order gm - C lowpass filter with a practical input linear range of 400mV P dedicated to ECG signal acquisition is proposed. This filter employs a degenerative source-coupled-pair circuit as a gm cell. It enhances the linear input range by a factor of × 4 compared with the source follower filter. Additionally, to mitigate the effect of current source mismatch, a dynamic element matching technique is applied. By doing so, HD2 is suppressed more than 1.5 dB over the entire passband frequency. This proposed filter is implemented in a 0.18 μ m CMOS process. It offers a 250-Hz bandwidth with input-referred noise and a dynamic range of 82.1 μ Vrms and 67.34 dB, respectively. The power consumption of 38.4 nW is achieved with a 1.2 V supply. Compared with other recent nano-power filters, the proposed filter provides the highest linear input range with competitive Figure-of-Merit to the top-tier designs. It is therefore beneficial to the practical implementation of a low-power ECG acquisition system.
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    A modified bipolar translinear cell with improved linear range and its applications
    (2012-12-28)
    Merz, Naruemo
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    Kiranon, Wiwat
    ;
    Wongtachathum, Chariya
    ;
    Pawarangkoon, Prajuab
    ;
    Narksarp, Wipavan
    This paper presents a technique to extend the linear input voltage range of a sinh mixed translinear cell proposed by Fabre [1]. This technique extends the linear operation range of the circuit by inserting common-anodeconnected pairs into the mixed translinear cell. Then the relationship between the output current and the input voltage is developed to be linear. The transconductance gain can be adjusted electronically while keeping its linearity. The performance of the proposed circuit is verified by mathematical analysis and by SPICE simulations. Finally, applications of the proposed cell in a floating resistor and a CCCII for designing an instrumentation amplifier are presented.
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    A novel high Q-bandpass filter employing a few grounded passive components
    (2005-12-01)
    Tongkulboriboon, Seangrawee
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    Petchakit, Wijittra
    ;
    Pawarangkoon, Prajuab
    ;
    Kiranon, Wiwat
    This paper proposes a novel current mode high Q bandpass filter with electronically tunable features based on second generation current controlled conveyor (CCCII). The configuration of the proposed circuit Is simple and very attractive for monolithic circuits owing to using a few grounded passive components. The center frequency and pole-Q can be Independently adjusted via dc bias currents of CCCIIs. The proposed filter Is verified by SPICE simulations and the results are given In order to confirm the validity of the proposed circuits. © 2005 IEEE.
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    Electronically current mode all-pass filter with only one grounded capacitor
    (2005-01-01)
    Tongkulboriboon, Seangrawee
    ;
    Pawarangkoon, Prajuab
    ;
    Petchakit, Wijittra
    ;
    Kiranon, Wiwat
    A novel current mode first order all-pass filter with electronically tunable feature based on second generation current controlled conveyor (CCCII) is presented. The configuration of the proposed circuit is simple and very attractive for monolithic circuits owing to using only one grounded capacitor and two CCCIIs. Phase shift characteristic of the current mode all-pass filter can be controlled by dc bias currents of the CCCIIs. The proposed circuit is verified by SPICE simulation and applied in current mode quadrature oscillator realization. The results from simulations are included in order to confirm the validity of the proposed circuits.
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    Electronically tunable floating resistor
    (2004-12-01)
    Pawarangkoon, Prajuab
    ;
    Intaudom, Vuttikai
    ;
    Kiranon, Wiwat
    A new design for an electronically tunable floating resistor is proposed The proposed circuit can be realized a positive or negative resistor without changing the circuit topology. Also, the resistance values of the circuit can be tuned electronically. The proposed circuit is based on only one second-generation current controlled conveyor, which is easy to be fabricated in IC technology. Simulation results are obtained to show adequate agreement with theory. © 2004IEEE.
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    Four-quadrant current-mode divider based on current conveyors
    (2004-12-01)
    Pawarangkoon, Prajuab
    ;
    Intaudom, Vuttikai
    ;
    Kiranon, Wiwat
    In this paper, a four-quadrant current-mode divider circuit is proposed The circuit employs only the current conveyors as active circuit elements and does not require external passive elements. It is therefore suitable for IC implementation. The circuit offers endurance on temperature variations. PSPICE simulation results are used to demonstrate the performance and accuracy of the proposed circuit. © 2004IEEE.