Proceedings of the IEEK Conference (대한전자공학회:학술대회논문집)
- 2002.07b
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- Pages.770-773
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- 2002
Design of the Voltage-Controlled Sinusoidal Oscillator Using an OTA-C Simulated Inductor
- Park, Ji-Mann (IC Card Research Team, ETRI) ;
- Chung, Won-Sup (Department of Semiconductor Engineering, Chongju University) ;
- Park, Young-Soo (IC Card Research Team, ETRI) ;
- Jun, Sung-Ik (IC Card Research Team, ETRI) ;
- Chung, Kyo-Il (IC Card Research Team, ETRI)
- Published : 2002.07.01
Abstract
Two sinusoidal voltage-controlled oscillators using linear operational transconductance amplifiers are presented in this paper: One is based on the positive-feedback bandpass oscillator model and the other on the negative-feedback Colpitts model. The bandpass VCO consists of a noninverting amplifier and a current-controlled LC-tuned circuit which is realized by two linear OTA's and two grounded capacitors, while the Colpitts VCO consists of an inverting amplifier and a current-controlled LC-tuned circuit realized by three linear OTA's and three grounded capacitors. Prototype circuits have been built with discrete components. The experimental results have shown that the Colpitts VCO has a linearity error of less than 5 percent, a temperature coefficient of less than rm 100 ppm/
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