Journal of IKEEE (전기전자학회논문지)
- Volume 11 Issue 3
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- Pages.122-128
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- 2007
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- 1226-7244(pISSN)
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- 2288-243X(eISSN)
A Design of LC-tuned Sinusoidal VCOs Using OTA-C Active Inductors
- Chung, Won-Sup (Department of Semiconductor Engineering, Cheongju University) ;
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Son, Sang-Hee
(Department of Semiconductor Engineering, Cheongju University)
- Published : 2007.09.28
Abstract
Sinusoidal voltage-controlled oscillators (VCOs) based on Colpitts and Hartley oscillators are presented. They consist of a LC parallel-tuned circuit connected in a negative-feedback loop with an OTA-R amplifier and two diode limiters, where the inductor is simulated one realized with temperature-stable linear operational transconductance amplifiers (OTAs) and a grounded capacitor. Prototype VCOs are built with discrete components. The Colpitts VCO exhibits less than 1% nonlinearity in its current-to-frequency transfer characteristic from 4.2 to 21.7 MHz and
Keywords
- Analog circuit;
- Voltage-controlled oscillator;
- Active inductor;
- Operational transconductance amplifier;
- Colpitts and Hartley oscillators