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Author: search.filters.author.Suksaibul, PichaiSubject: search.filters.subject.operational transconductance amplifier

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    A Novel Low-Power Mixed-Mode Universal Filter Design Using Multiple-Input Operational Transconductance Amplifiers
    (2026-06-01)
    Khateb, Fabian
    ;
    Suksaibul, Pichai
    ;
    Kulej, Tomasz
    ;
    Kumngern, Montree
    This study introduces an innovative mixed-mode universal biquad filter implemented using multiple-input operational transconductance amplifiers (MI-OTAs). Based on the advantage of OTAs, which possess multiple inputs, the proposed mixed-mode universal filter using MI-OTAs can implement both non-inverting and inverting standard filtering functions such as low-pass, high-pass, band-pass, band-stop, and all-pass filters in voltage-mode, transadmittance-mode, current-mode, and transimpedance-mode, which is the maximum capability of mixed-mode universal filters. The natural frequency of all filtering functions can be electronically controlled. Based on the multiple-input bulk-driven MOS transistor (MOST) technique, the OTA can also operate at very low supply voltage and provide wide-input voltage swing. The technique of MOST, operating in the weak inversion region, is used to achieve the low-power consumption of OTA. The MI-OTA circuit and mixed-mode universal filter were designed and simulated using Cadence Virtuoso, utilizing TSMC’s 65-nm CMOS technology. At a 0.5 V supply voltage, the filter demonstrated a simulated power consumption of 450 nW at a natural frequency of 156 Hz. In these ranges of power consumption and natural frequency, it can be expected that the proposed filter can be built as an versatile integrated circuit for low-frequency applications such as bio-signal processing. The design parameters were successfully validated through both post-layout extractions and discrete hardware prototyping utilizing commercially available LM13700N ICs.
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    Four-input one-output voltage-mode universal filter using simple OTAs
    (2019-05-01)
    Kumngern, Montree
    ;
    Suksaibul, Pichai
    ;
    Khateb, Fabian
    This paper presents a new electronically tunable voltage-mode universal filter with four-input one-output employing six simple operational transconductance amplifiers (OTAs), two grounded capacitors and two MOS resistors. The use of grounded passive components is beneficial for integrated circuit implementation. The proposed filter can realize low-pass, band-pass, high-pass, band-stop and all-pass filtering functions without active and passive component-matching conditions and inverting-type input signals requirements. The natural frequency and quality factor can be tuned independently and electronically by adjusting the bias currents. The voltage-mode filter offers the features of high-input impedance and low active and passive sensitivities. The characteristics of the proposed universal filter are verified using PSPICE simulators through 0.35μm CMOS process. Experimental results are used to confirm the workability of proposed circuit through LM13600 commercially available OTAs. Also a digitally programmable filter is shown to confirm the advantage of multiple-input universal filter.
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    Five-Input One-Output Universal Filter Using Simple CMOS OTAs
    (2018-07-02)
    Knobnob, Boonying
    ;
    Suksaibul, Pichai
    ;
    Kumngern, Montree
    This paper presents a new five-input one-output voltage-mode universal filter using simple operational transconductance amplifiers (OTAs). The circuit uses six OTAs and two grounded capacitors. The circuit can realize low-pass, band-pass, high-pass, band-stop and all-pass filters into one topology. The natural frequency and the quality factor of filters can be electronically controlled by adjusting the bias currents. Also, the circuit possesses high input impedance for all filtering functions. The simulation results have been verified by PSPICE simulations using 0.18 μm CMOS process from TSMC.
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    High-input impedance four-input one-output voltage-mode universal filter using OTAs
    (2014-01-01)
    Kumngern, Montree
    ;
    Suksaibul, Pichai
    ;
    Knobnob, Boonying
    This paper presents a new electronically tunable voltage-mode universal filter with four-input one-output using six single-ended operational transconductance amplifiers, two grounded capacitors and two MOS resistors. The proposed circuit can realize of lowpass, bandpass, highpass, bandstop and allpass filters, without component-matching conditions and inverting input signals requirements. The natural frequency and the quality factor can be tuned orthogonally and electronically by adjusting the bias currents. The filter offers the features of high input impedances, low active and passive sensitivities and use of grounded passive components which is ideal for integrated circuit implementation. The workability of the proposed circuit is confirmed using PSPICE simulators. © 2014 IEEE.