JPS6242633A - Universal digital clock extracting circuit - Google Patents

Universal digital clock extracting circuit

Info

Publication number
JPS6242633A
JPS6242633A JP18223885A JP18223885A JPS6242633A JP S6242633 A JPS6242633 A JP S6242633A JP 18223885 A JP18223885 A JP 18223885A JP 18223885 A JP18223885 A JP 18223885A JP S6242633 A JPS6242633 A JP S6242633A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
part
signal
division ratio
frequency division
lead
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP18223885A
Inventor
Yuji Kato
Toshio Shimoe
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Abstract

PURPOSE: To generate clocks synchronized stably with signal inputs having various kinds of transmission speed by changing the clock frequency division ratio in accordance with a lead/leg detection signal inputted from a loop filter part of a digital PLL.
CONSTITUTION: The phase of an inputted digital coded signal and that of an output digital clock are compared with each other by a phase comparing part 120, and a lead signal F0 or a lag signal D0 is outputted in every period of clocks from a clock generating part 110. Signals F0 and D0 are filtered by a loop filter part 130 and are inputted to a frequency division ratio determining part 140. If the number of lead detection signals F1 of lag detection signals D1 exceeds a prescribed non-transient threshold, the frequency division ratio determining part 140 generates a frequency division ratio designating signal which raises the frequency division ratio in case of lead and reduces it in case of lag, and the clock of the clock generating part 110 has the frequency divided by a frequency dividing part 150 and is outputted.
COPYRIGHT: (C)1987,JPO&Japio
JP18223885A 1985-08-20 1985-08-20 Universal digital clock extracting circuit Pending JPS6242633A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18223885A JPS6242633A (en) 1985-08-20 1985-08-20 Universal digital clock extracting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18223885A JPS6242633A (en) 1985-08-20 1985-08-20 Universal digital clock extracting circuit

Publications (1)

Publication Number Publication Date
JPS6242633A true true JPS6242633A (en) 1987-02-24

Family

ID=16114757

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18223885A Pending JPS6242633A (en) 1985-08-20 1985-08-20 Universal digital clock extracting circuit

Country Status (1)

Country Link
JP (1) JPS6242633A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63107230A (en) * 1986-10-24 1988-05-12 Hitachi Ltd Digital pll circuit
JPS6460018A (en) * 1987-08-31 1989-03-07 Fujitsu Ltd Phase synchronizing circuit
JPH04234225A (en) * 1990-08-14 1992-08-21 American Teleph & Telegr Co <Att> Digital phase-locked loop
JPH0677819A (en) * 1992-03-02 1994-03-18 Internatl Business Mach Corp <Ibm> Digital circuit phase restoration device
WO2001015347A1 (en) * 1999-08-20 2001-03-01 Fujitsu Limited Optical communication system, optical receiver, and wavelength converter
JP2002314509A (en) * 2001-04-12 2002-10-25 Hitachi Commun Syst Inc Wavelength converter and wavelength multiplex optical communication device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63107230A (en) * 1986-10-24 1988-05-12 Hitachi Ltd Digital pll circuit
JPS6460018A (en) * 1987-08-31 1989-03-07 Fujitsu Ltd Phase synchronizing circuit
JPH04234225A (en) * 1990-08-14 1992-08-21 American Teleph & Telegr Co <Att> Digital phase-locked loop
JPH0677819A (en) * 1992-03-02 1994-03-18 Internatl Business Mach Corp <Ibm> Digital circuit phase restoration device
WO2001015347A1 (en) * 1999-08-20 2001-03-01 Fujitsu Limited Optical communication system, optical receiver, and wavelength converter
US6594070B2 (en) 1999-08-20 2003-07-15 Fujitsu Limited Optical communication system, optical receiver and wavelength converter
JP2002314509A (en) * 2001-04-12 2002-10-25 Hitachi Commun Syst Inc Wavelength converter and wavelength multiplex optical communication device
JP4567231B2 (en) * 2001-04-12 2010-10-20 日立情報通信エンジニアリング株式会社 Wavelength converters and wavelength-multiplexed optical communication system

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