Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)
- 2005.07c
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- Pages.2333-2335
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- 2005
Comparison of phase noise characteristic of Quadrature Voltage Controlled Oscillator
직교신호 발생 전압제어 발진기의 위상 잡음 특성비교
- Cho, Il-Hyun (Dept. Electrical & Computer Engineering, University of Seoul) ;
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Lee, Moon-Que
(Dept. Electrical & Computer Engineering, University of Seoul) ;
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Kim, Hyeong-Seok
(School of Electrical & Electronics Engineering, Chungang Univ.)
- Published : 2005.07.18
Abstract
Various CMOS quadrature-voltage-controlled oscillators(QVCOs) are designed and fabricated for the comparison of the phase noise. The core VCO is composed of two Colpitts oscillators which are cross-coupled with PMOS pair. For the comparison of phase noise with the proposed scheme, the conventional LC VCO followed by the frequency-divide-by-two is designed. The simulation result demonstrate that the proposed scheme shows better phase noise performance by 6dB than that of a conventional scheme in which LC VCO is followed by the frequency-divide-by-two.
Keywords