Publicação: A linearly-tunable OTA-C sinusoidal oscillator for low-voltage applications
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A low-voltage, low-power OTA-C sinusoidal oscillator based on a triode-MOSFET transconductor is here 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. According to a standard 0.8μm CMOS n-well process, a prototype was integrated, with an effective area of 0.28mm2. Experimental data validate the theoretical analysis. For a single 1.8V-supply and 100mV≤VTUNE≤250mV, the oscillation frequency fo ranges from 0.50MHz to 1.125MHz, with a nearly constant gain KVCO=4.16KHz/mV. Maximum output amplitude is 374mVpp @1.12MHz. THD is -41dB @321mVpp. Maximum average consumption is 355μW.
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CMOS integrated circuits, Computer simulation, Electric network topology, Integrated circuit layout, MOSFET devices, Numerical analysis, Quadrature amplitude modulation, Transconductance, Transfer functions, Amplitude stabilization element, Circuit complexity, Finite source resistance, Maximum output amplitude, Oscillation frequency, Variable frequency oscillators
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Proceedings - IEEE International Symposium on Circuits and Systems, v. 2.
