대한전기학회:학술대회논문집 (Proceedings of the KIEE Conference)

대한전기학회 (The Korean Institute of Electrical Engineers)
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직교신호 발생 전압제어 발진기의 위상 잡음 특성비교

Comparison of phase noise characteristic of Quadrature Voltage Controlled Oscillator

  • 조일현 (서울시립대학교 전자전기컴퓨터공학부) ;
  • 이문규 (서울시립대학교 전자전기컴퓨터공학부) ;
  • 김형석 (중앙대학교 전자전기공학부)
  • Cho, Il-Hyun (Dept. Electrical & Computer Engineering, University of Seoul) ;
  • Lee, Moon-Que (Dept. Electrical & Computer Engineering, University of Seoul) ;
  • Kim, Hyeong-Seok (School of Electrical & Electronics Engineering, Chungang Univ.)
  • 발행 : 2005.07.18
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초록

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.

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