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두 개의 Frequency Detector를 가지고 있는 Charge Pump PLL 의 최적설계에 관한 연구
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  • 두 개의 Frequency Detector를 가지고 있는 Charge Pump PLL 의 최적설계에 관한 연구
저자명
우영신,장영민,성만영,Woo. Young-Shin,Jang. Young-Min,Sung. Man-Young
간행물명
전기학회논문지. The transactions of the Korean Institute of Electrical Engineers. D / D, 시스템 및 제어부문
권/호정보
2001년|50권 10호|pp.479-485 (7 pages)
발행정보
대한전기학회
파일정보
정기간행물|
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기타
이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

In this paper, we introduce a charge pump phase-locked loop (PLL) architecture which employs a precharge phase frequency detector (PFD) and a sequential PFD to achieve a high frequency operation and a fast acquisition. Operation frequency is increased by using the precharge PFD when the phase difference is within $-{pi}{sim}{pi}$ and acquisition time is shortened by using the sequential PFD and the increased charge pump current when the phase difference is larger than ${pm}{pi}$. So error detection range of the proposed PLL structure is not limited to $-{pi}{sim}{pi}$ and a high frequency operation and a higher speed lock-up time can be achieved. The proposed PLL was designed using 1.5 ${mu}m$ CMOS technology with 5V supply voltage to verify the lock in process. The proposed PLL shows successful acquisition for 200 MHz input frequency. On the other hand, the conventional PLL with the sequential PFD cannot operate at up to 160MHz. Moreover, the lock-up time is drastically reduced from 7.0 ${mu}s;to;2.0;{mu}s$ only if the loop bandwidth to input frequency ratio is regulated by the divide-by-4 counter during the acquisition process. By virtue of this dual PFDs, the proposed PLL structure can improve the trade-off between acquisition behavior and locked behavior.