Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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A Study on the Improvement of Characteristics of Precharge PFD

Precharge형 PFD의 동작 특성 개선에 관한 연구

  • Woo, Young-Shin (Semiconductor & CAD Lab., Department of Electrical Engineering, Korea University) ;
  • Kim, Du-Gon (Semiconductor & CAD Lab., Department of Electrical Engineering, Korea University) ;
  • Oh, Reum (Semiconductor & CAD Lab., Department of Electrical Engineering, Korea University) ;
  • Sung, Man-Young (Semiconductor & CAD Lab., Department of Electrical Engineering, Korea University)
  • 우영신 (고려대학교 대학원 전기공학과 반도체 CAD 연구실) ;
  • 김두곤 (고려대학교 대학원 전기공학과 반도체 CAD 연구실) ;
  • 오름 (고려대학교 대학원 전기공학과 반도체 CAD 연구실) ;
  • 성만영 (고려대학교 대학원 전기공학과 반도체 CAD 연구실)
  • Published : 2000.07.17
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Abstract

In this paper, we introduce a charge pump PLL architecture which employs precharge phase frequency detector(PFD) and sequential PFD to achieve high frequency operation and fast acquisition. Operation frequency is increased by using precharge PFD when the phase difference is within -${\pi}\;{\sim}\;{\pi}$ and acquisition time is shortened by using sequential PFD and increased charge pump current when the phase difference is larger than |${\pi}$|. SO error detection range of proposed PLL structure is not limited to -${\pi}\;{\sim}\;{\pi}$. By virtue of this multi-phase frequency detector structure, the maximum operating frequency of 423MHz at 2.5V and faster acquisition were achieved by simulation.

Keywords