Abstract
An LC-tuned sinusoidal voltage-controlled oscillator (VCO) using temperature-stable linear operational transconductance amplifiers (OTAs) is presented. Its architecture is based on Hartley oscillator configuration, where the inductor is simulated one realized with two OTAs and a grounded capacitor. Two diode limiters are used for limiting amplitude. A prototype oscillator built with discrete components exhibits less than 3.1% nonlinearity in its current-to-frequency transfer characteristic from 1.99 to 39.14 MHz and 220 ppm/oC frequency stability to the temperature drift over 0 to 75 oC. The total harmonic distortion (THD) is as low as 4.4 % for a specified frequency-tuning range. The phase noise of the VCO is about -108.9 dBc/Hz at 1 MHz offset frequency and Its property of phase noise of VCO is better than colpitts-VCO.
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