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Author: search.filters.author.Knobnob, BoonyingSubject: search.filters.subject.operational transconductance amplifier

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    1 V Tunable High-Quality Universal Filter Using Multiple-Input Operational Transconductance Amplifiers
    (2024-05-01)
    Kumngern, Montree
    ;
    Khateb, Fabian
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    Kulej, Tomasz
    ;
    Knobnob, Boonying
    This paper presents a new multiple-input single-output voltage-mode universal filter employing four multiple-input operational transconductance amplifiers (MI-OTAs) and three grounded capacitors suitable for low-voltage low-frequency applications. The quality factor (Q) of the filter functions can be tuned by both the capacitance ratio and the transconductance ratio. The multiple inputs of the OTA are realized using the bulk-driven multiple-input MOS transistor technique. The MI-OTA-based filter can also offer many filtering functions without additional circuitry requirements, such as an inverting amplifier to generate an inverted input signal. The proposed filter can simultaneously realize low-pass, high-pass, band-pass, band-stop, and all-pass responses, covering both non-inverting and inverting transfer functions in a single topology. The natural frequency and the quality factors of all the filtering functions can be controlled independently. The natural frequency can also be electronically controlled by tuning the transconductances of the OTAs. The proposed filter uses a 1 V supply voltage, consumes 120 μW of power for a 5 μA setting current, offers 40 dB of dynamic range and has a third intermodulation distortion of −43.6 dB. The performances of the proposed circuit were simulated using a 0.18 μm TSMC CMOS process in the Cadence Virtuoso System Design Platform to confirm the performance of the topology.
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    Electronically Tunable Differential Difference Current Conveyor Using OTAs
    (2021-04-01)
    Sukhawit, Chuthitep
    ;
    Burapattanasiri, Bancha
    ;
    Torteanchai, Usa
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    Lerkvaranyu, Somkiat
    ;
    Knobnob, Boonying
    This paper presents a new electronically tunable differential difference current conveyor (DDCC) using operational transconductance amplifiers (OTAs). Unlike conventional DDCC, the proposed DDCC offers current gain between z- and x-terminal that can be controlled electronically by bias currents. The DDCC-based OTA can be investigated both simulation and experiment tests. The proposed DDCC is used to implement a quadrature oscillator to confirm workability.
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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.