JPS6432532A - Phase locked loop circuit - Google Patents

Phase locked loop circuit

Info

Publication number
JPS6432532A
JPS6432532A JP62186654A JP18665487A JPS6432532A JP S6432532 A JPS6432532 A JP S6432532A JP 62186654 A JP62186654 A JP 62186654A JP 18665487 A JP18665487 A JP 18665487A JP S6432532 A JPS6432532 A JP S6432532A
Authority
JP
Japan
Prior art keywords
frequency
harmonic
vco
output
divider
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
JP62186654A
Other languages
Japanese (ja)
Other versions
JPH0797745B2 (en
Inventor
Yasuo Kobayashi
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.)
Hitachi Denshi KK
Original Assignee
Hitachi Denshi KK
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 Hitachi Denshi KK filed Critical Hitachi Denshi KK
Priority to JP62186654A priority Critical patent/JPH0797745B2/en
Publication of JPS6432532A publication Critical patent/JPS6432532A/en
Publication of JPH0797745B2 publication Critical patent/JPH0797745B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L2207/00—Indexing scheme relating to automatic control of frequency or phase and to synchronisation
    • H03L2207/10—Indirect frequency synthesis using a frequency multiplier in the phase-locked loop or in the reference signal path

Abstract

PURPOSE:To quicken the lock time by providing a harmonic wave selection amplifier circuit between a VCO and a variable frequency divider to increase a reference frequency at the same frequency interval. CONSTITUTION:An output of a VCO 4 includes a fundamental wave and its harmonic waves, the signals are given to a harmonic selection amplifier circuit 5 and a signal only at a high level in optional harmonics is amplified selectively and sent to a variable frequency divider 6. The frequency divider 6 is operated at a frequency with the maximum level in the input frequency. When the number of order of the harmonic is N, the output of the circuit 5 is N.f0 and the comparison signal frequency of a phase comparator 2 is N.f0/M, where M is the frequency division number of the frequency divider 6 and it is equal to a reference frequency fR in the stable state of the PLL system. Thus, the frequency interval f with respect to the fundamental wave fR of the output of the VCO 4 is fR/N. As a result, the operation at a frequency being an optional integer multiple of the frequency is attained in response to the requirement of the f based on the reference frequency fR.
JP62186654A 1987-07-28 1987-07-28 Phase synchronization circuit Expired - Lifetime JPH0797745B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62186654A JPH0797745B2 (en) 1987-07-28 1987-07-28 Phase synchronization circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62186654A JPH0797745B2 (en) 1987-07-28 1987-07-28 Phase synchronization circuit

Publications (2)

Publication Number Publication Date
JPS6432532A true JPS6432532A (en) 1989-02-02
JPH0797745B2 JPH0797745B2 (en) 1995-10-18

Family

ID=16192352

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62186654A Expired - Lifetime JPH0797745B2 (en) 1987-07-28 1987-07-28 Phase synchronization circuit

Country Status (1)

Country Link
JP (1) JPH0797745B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0903860A1 (en) * 1997-09-17 1999-03-24 Matsushita Electric Industrial Co., Ltd. PLL frequency synthesizer
US8180252B2 (en) 2008-07-25 2012-05-15 Brother Kogyo Kabushi Kaisha Photosensitive body for electro-photography

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0903860A1 (en) * 1997-09-17 1999-03-24 Matsushita Electric Industrial Co., Ltd. PLL frequency synthesizer
US6441692B1 (en) 1997-09-17 2002-08-27 Matsushita Electric Industrial Co., Ltd. PLL frequency synthesizer
US8180252B2 (en) 2008-07-25 2012-05-15 Brother Kogyo Kabushi Kaisha Photosensitive body for electro-photography

Also Published As

Publication number Publication date
JPH0797745B2 (en) 1995-10-18

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