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A linearly-tunable OTA-C sinusoidal oscillator for low-voltage applications

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1 Author(s)
De Lima, J.A. ; Dept. Electr. Eng., Univ. Estadual Paulista, Guaratingueta, Brazil

A low-voltage, low-power OTA-C sinusoidal oscillator based on a triode-MOSFET transconductor is discussed. The classical quadrature model is employed and the transconductor inherent nonlinear characteristic with input voltage is used as the amplitude-stabilization element. An external bias VTUNE linearly adjusts the oscillation frequency. Using a standard 0.8 μm CMOS n-well process, a prototype was integrated, with an effective area of 0.28 mm2. Experimental data validated the theoretical analysis. For a single 1.8 V-supply and 100 mV≤VTUNE≤250 mV, the oscillation frequency fo ranges from 0.50 MHz to 1.125 MHz, with a nearly constant gain KVCO=4.16 kHz/mV. Maximum output amplitude is 374 mVpp @ 1.12 MHz. THD is -41 dB @ 321 mVpp. Maximum average consumption is 355 μW.

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Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on  (Volume:2 )

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