A DLL-Based Frequency Synthesizer for Generation of Various Clocks

가변 클록 발생을 위한 DLL 주파수 합성기

  • 이지현 (부경대학교 전자컴퓨터정보통신공학부) ;
  • 송윤귀 (부경대학교 전자컴퓨터정보통신공학부) ;
  • 최영식 (부경대학교 전자컴퓨터정보통신공학부) ;
  • 최혁환 (부경대학교 전자컴퓨터정보통신공학부) ;
  • 류지구 (부경대학교 전자컴퓨터정보통신공학부)
  • Published : 2004.10.01

Abstract

This paper describes a new programmable DLL_based frequency synthesizer. Generally, PLLs have been used for frequency synthesis. Inherent fast locking DLLs are also used for frequency synthesis. However, DLL needs a frequency multiplier for various frequencies. A conventional frequency multiplier used in DLL has a restriction in which a multiple is fixed. However, the proposed DLL can generate clocks which are from 6 times to 10 times of the reference clock. Frequency range of the proposed DLL is from 600MHz to 1GHz. The idea has been confirmed by HSPICE simulations in a $0.35-\mu\textrm{m}$ CMOS process.

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