JPS6434017A - Frequency synthesizer using phase locked loop - Google Patents

Frequency synthesizer using phase locked loop

Info

Publication number
JPS6434017A
JPS6434017A JP62189951A JP18995187A JPS6434017A JP S6434017 A JPS6434017 A JP S6434017A JP 62189951 A JP62189951 A JP 62189951A JP 18995187 A JP18995187 A JP 18995187A JP S6434017 A JPS6434017 A JP S6434017A
Authority
JP
Japan
Prior art keywords
frequency
frequency divider
phase
circuit
signal
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.)
Granted
Application number
JP62189951A
Other languages
Japanese (ja)
Other versions
JPH0761010B2 (en
Inventor
Shinichi Sekine
Yoshihiko Kamo
Fumitaka Asami
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 JP62189951A priority Critical patent/JPH0761010B2/en
Publication of JPS6434017A publication Critical patent/JPS6434017A/en
Publication of JPH0761010B2 publication Critical patent/JPH0761010B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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

Abstract

PURPOSE:To minimize the fluctuation of an output signal frequency and to complete phase locking in a short time, by supplying and outputting a signal to a phase comparator compulsorily immediately after starting the frequency division operation of a second frequency divider by an OR circuit. CONSTITUTION:The OR circuit 16 takes the OR of the output signal of a third control circuit 15 and that of the second frequency divider 12, and outputs a pulse with certain width immediately after starting the operation of the second frequency divider 12, then supplies it to the phase comparator 3, and performs phase comparison with a frequency division signal from a first frequency divider 11 by the comparator. Since a gate circuit 17 is set at a gate open state during the reset cancelling period of the second frequency divider 12, the output error signal of the phase comparator 3 passes the gate circuit 17, and is inputted to a charge pump 5, and is converted three values, (L), (H), or (Z) (high impedance), and is supplied to a low-pass filter 6. In such a way, it is possible to minimize the fluctuation of the output signal frequency at the time of starting respective operation of a phase locked loop (PLL), and to shorten a time to complete the phase locking.
JP62189951A 1987-07-29 1987-07-29 Frequency synthesizer using phase-locked loop Expired - Lifetime JPH0761010B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62189951A JPH0761010B2 (en) 1987-07-29 1987-07-29 Frequency synthesizer using phase-locked loop

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62189951A JPH0761010B2 (en) 1987-07-29 1987-07-29 Frequency synthesizer using phase-locked loop

Publications (2)

Publication Number Publication Date
JPS6434017A true JPS6434017A (en) 1989-02-03
JPH0761010B2 JPH0761010B2 (en) 1995-06-28

Family

ID=16249927

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62189951A Expired - Lifetime JPH0761010B2 (en) 1987-07-29 1987-07-29 Frequency synthesizer using phase-locked loop

Country Status (1)

Country Link
JP (1) JPH0761010B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0429412A (en) * 1990-05-23 1992-01-31 Matsushita Electric Ind Co Ltd Phase comparator
US6173025B1 (en) 1997-05-02 2001-01-09 Nec Corporation PLL frequency synthesizer using frequency dividers reset by initial phase difference

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0429412A (en) * 1990-05-23 1992-01-31 Matsushita Electric Ind Co Ltd Phase comparator
US6173025B1 (en) 1997-05-02 2001-01-09 Nec Corporation PLL frequency synthesizer using frequency dividers reset by initial phase difference

Also Published As

Publication number Publication date
JPH0761010B2 (en) 1995-06-28

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