Log-Domain Current-mode Quadrature Sinusoidal Oscillator
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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 2.5V. The oscillation frequency is controlled over four decades of frequency. The total harmonic distortions for two-phases QSO (12MHz) 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.
KeywordsLog-domain filtering, high-frequency, low-voltage, electronically-controlled, quadrature oscillator
Document typePeer reviewed
Document versionFinal PDF
SourceRadioengineering. 2011, vol. 20, č. 3, s. 600-607. ISSN 1210-2512
- 2011/3