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Author: search.filters.author.Thanachayanont, A.Subject: search.filters.subject.Class-AB

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    Sub 1-V highly-linear low-power class-AB bulk-driven tunable CMOS transconductor
    (2013-06-01)
    Yodtean, A.
    ;
    Thanachayanont, A.
    This paper describes the design and realization of a sub 1-V low power class-AB bulk-driven tunable linear transconductor using a 0.18-μm CMOS technology. The proposed transconductor employs a class-AB bulk-driven differential input voltage follower and a passive resistor to achieve highly linear voltage-to-current conversion. Transconductance tuning is achieved by tuning the differential output current of the core transconductor with gain-adjustable current mirrors. With 10.4-μA current consumption from a 0.8-V single power supply voltage, simulation results show that the proposed transconductor achieves the total harmonic distortion (THD) of <-40 dB for a peak differential input voltage range of 800 mV at frequencies up to 10 kHz. The simulated input-referred noise voltage integrated over 10-kHz bandwidth is 100 μV, resulting to an input signal dynamic range of 75 dB for THD <-40 dB. A biquadratic G<inf>m</inf>-C filter is designed to demonstrated the performance of the proposed transconductor. At the nominal 10-kHz cut-off frequency, the filter dissipates 34.4 μW from a 0.8-V supply voltage and it achieves an input signal dynamic range of 67.4 dB for the third-order intermodulation distortion of <-40 dB. © 2013 Springer Science+Business Media New York.
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    Low-voltage Gm-enhanced class-AB pseudo-differential OTA for switched-capacitor circuits
    (2004-12-01)
    Chaloenlarp, W.
    ;
    Thanachayanont, A.
    A new low-voltage, rail-to-rail output swing, class-AB pseudo-differential operational transconductance amplifier (OTA) for high-speed switched-capacitor applications is proposed. Positive feedback is employed to enhance the input transconductance, which increases the open-loop DC gain and the unity-gain frequency of the OTA. Using a 0.35-μm CMOS process, the proposed OTA can obtain 78-dB DC gain, 72.5° phase margin, 100-V/μs slew rate with 1-pF load capacitor, while draining 170-μA quiescent supply current from a single 1- V power supply voltage. © 2004IEEE.