JPS6460019A - Wide band phase locked oscillator - Google Patents

Wide band phase locked oscillator

Info

Publication number
JPS6460019A
JPS6460019A JP62215232A JP21523287A JPS6460019A JP S6460019 A JPS6460019 A JP S6460019A JP 62215232 A JP62215232 A JP 62215232A JP 21523287 A JP21523287 A JP 21523287A JP S6460019 A JPS6460019 A JP S6460019A
Authority
JP
Japan
Prior art keywords
capacitance
output
frequencies
controlled oscillator
voltage controlled
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
JP62215232A
Other languages
Japanese (ja)
Inventor
Yoshiaki Kumagai
Eiji Itaya
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
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
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP62215232A priority Critical patent/JPS6460019A/en
Publication of JPS6460019A publication Critical patent/JPS6460019A/en
Pending legal-status Critical Current

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  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To prevent a noise spectrum and phase noise characteristics from changing, by changing a capacitance to decide the time constant of a loop filter in accordance with output frequencies, and making a loop band approximately constant over a whole oscillating frequency band. CONSTITUTION:A variable diode capacity C is changed by the output of s capacitance control means 6, at which the output frequencies of a voltage controlled oscillator 5 are made into a control input, so that a capacitance C may become large when the output frequencies f0 of the voltage controlled oscillator 5 are low, and the capacitance C may become small when the output frequencies are high. Thus, the loop band is maintained almost constantly. Thus, the change of the noise spectrum is suppressed, and the phase noise characteristics do not so much depend on the frequencies of the output signal of the voltage controlled oscillator 5.
JP62215232A 1987-08-31 1987-08-31 Wide band phase locked oscillator Pending JPS6460019A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62215232A JPS6460019A (en) 1987-08-31 1987-08-31 Wide band phase locked oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62215232A JPS6460019A (en) 1987-08-31 1987-08-31 Wide band phase locked oscillator

Publications (1)

Publication Number Publication Date
JPS6460019A true JPS6460019A (en) 1989-03-07

Family

ID=16668899

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62215232A Pending JPS6460019A (en) 1987-08-31 1987-08-31 Wide band phase locked oscillator

Country Status (1)

Country Link
JP (1) JPS6460019A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03205920A (en) * 1989-10-30 1991-09-09 Hitachi Ltd Phase locked circuit, storage device and magnetic disk storage device
US6266200B1 (en) 1989-10-30 2001-07-24 Hitachi, Ltd Magnetic disk storage apparatus
JP2011041298A (en) * 2005-08-24 2011-02-24 Qualcomm Inc Phase locked loop system having locking and tracking mode of operation
KR101135678B1 (en) * 2009-11-12 2012-04-13 주식회사 자이벡 Cleaner

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03205920A (en) * 1989-10-30 1991-09-09 Hitachi Ltd Phase locked circuit, storage device and magnetic disk storage device
US6266200B1 (en) 1989-10-30 2001-07-24 Hitachi, Ltd Magnetic disk storage apparatus
JP2011041298A (en) * 2005-08-24 2011-02-24 Qualcomm Inc Phase locked loop system having locking and tracking mode of operation
KR101135678B1 (en) * 2009-11-12 2012-04-13 주식회사 자이벡 Cleaner

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