Prommee, Pipat

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Prommee, Pipat
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Prommee, P.
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pipat.pr@kmitl.ac.th

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    Item type:Publication,
    Log-domain current-mode quadrature sinusoidal oscillator
    (2011-12-14)
    Prommee, Pipat
    ;
    Prapakorn, Nattawit
    ;
    Swamy, M. N.S.
    A log-domain current-mode quadrature sinusoidal oscillator based on lossless integrators is presented. The circuit is a direct realization of a first-order differential equation for obtaining the lossy and lossless integrators. Each of the log-domain lossless integrators is realized by using only NPN transistors and a grounded capacitor for achieving low-power and fast response. The proposed oscillator uses two-lossless integrator loop which can be electronically tuned through bias currents. A validated BJT model which is used in SPICE simulation operated from a single power supply as low as 2.5 V. The oscillation frequency is controlled over four decades of frequency. The total harmonic distortions for two-phases QSO (12 MHz) is obtained around 0.93% which enables fully integrated in telecommunication systems. The proposed circuit is also suitable for high-frequency applications. Nonideality studies are included and PSpice simulation results confirm the theoretical results.