Proceedings of the IEEK Conference (대한전자공학회:학술대회논문집)
- 2006.06a
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- Pages.519-520
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- 2006
Optimized Voltage Controlled Oscillator(VCO) for Fractional-N Frequency Synthesizer
Fractional-N 주파수 합성기를 위한 위상 잡음 특성이 개선된 전압 제어 발진기
- Ahn, Jin-Oh (School of Electrical Engineering Kookmin University) ;
- Seo, Woo-Hyeong (School of Electrical Engineering Kookmin University) ;
- Kim, In-Jeong (School of Electrical Engineering Kookmin University) ;
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Kim, Dae-Jeong
(School of Electrical Engineering Kookmin University)
- 안진오 (국민대학교 전자정보통신대학 전자정보통신공학부) ;
- 서우형 (국민대학교 전자정보통신대학 전자정보통신공학부) ;
- 김인정 (국민대학교 전자정보통신대학 전자정보통신공학부) ;
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김대정
(국민대학교 전자정보통신대학 전자정보통신공학부)
- Published : 2006.06.21
Abstract
In this paper, we propose a voltage-controlled ring oscillator (VCO) for a 900 MHz low-noise fractional-N frequency synthesizer. The VCO delay cell is based on an nMOS source-coupled pair with load elements [1] and a combined tail current sources which consist of a large and a small current source to control the integer and fractional behaviors, respectively. The Spectre simulation results of the scheme in a 0.18um CMOS process show the accurate control of the KVCO better than the conventional one.
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