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Subject: search.filters.subject.CMOS OTA

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    A novel versatile modulator circuit
    (2009-05-01)
    Tuwanut, Panwit
    ;
    Koseeyaporn, Jeerasuda
    ;
    Wardkein, Paramote
    A novel versatile modulator that can operate either as a delta modulator, a sigma-delta modulator, an amplitude modulator or a frequency modulator is presented. The proposed circuit mainly composes of a few components: which are three OTAs, one capacitor and two resistors. Among these components, two OTAs and two resistor construct a Schmitt trigger network whereas the other OTA and a capacitor compose an integrator. The advantage of this circuit is that the clock (carrier) signal employed for modulation is inherent in the circuit. No external clock is needed, only the modulating signal is required for an input. With the compactness of the circuit, it is thus suitable for IC realization. The computer simulation based on CMOS technology demonstrates that the results agree well with the theoretical analysis. © 2008 Elsevier GmbH. All rights reserved.
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    On the realization of electronically current-tunable CMOS OTA
    (2007-05-02)
    Kaewdang, Khanittha
    ;
    Surakampontorn, Wanlop
    A CMOS operational transconductance amplifier (OTA) called as an EOTA, where its transconductance gain can be electronically and linearly tuned is proposed in this paper. The realization method is achieved by squaring the transconductance gain of the balanced CMOS OTA. The EOTA transconductance gain can be linearly tuned by an external bias current for three decades. The linear input-voltage range of about 1 Vp with less than 1% nonlinearity is obtained. The usefulness of the proposed EOTA is demonstrated through application example with a current multiplier. The performance of the proposed circuit is discussed and confirmed through PSPICE-simulation results. © 2006 Elsevier GmbH. All rights reserved.
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    Electronically tunable floating CMOS resistor using OTA
    (2005-12-01)
    Kaewdang, Khanittha
    ;
    Kumwachara, Kiattisak
    ;
    Surakampontorn, Wanlop
    A new CMOS OTA-based circuit is proposed to realize electronically tunable positive and negative floating resistors. The circuit employs two balanced OTAs and one fully differential OTA. The value of realized resistance can be linearly controlled by an external DC bias current over the range of more than 3 decades. The performances of the proposed circuit are discussed and confirmed through PSPICE simulation. © 2005 IEEE.