JPS5745730A - Phase-locked loop circuit - Google Patents

Phase-locked loop circuit

Info

Publication number
JPS5745730A
JPS5745730A JP55119838A JP11983880A JPS5745730A JP S5745730 A JPS5745730 A JP S5745730A JP 55119838 A JP55119838 A JP 55119838A JP 11983880 A JP11983880 A JP 11983880A JP S5745730 A JPS5745730 A JP S5745730A
Authority
JP
Japan
Prior art keywords
loop
frequency
phase
proportional
voltage
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
JP55119838A
Other languages
Japanese (ja)
Inventor
Yukio Murayama
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 JP55119838A priority Critical patent/JPS5745730A/en
Publication of JPS5745730A publication Critical patent/JPS5745730A/en
Pending 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
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
    • H03L7/183—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number
    • 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
    • H03L2207/04—Modifications for maintaining constant the phase-locked loop damping factor when other loop parameters change

Abstract

PURPOSE:To keep the stability of a loop, by changing the loop gain through the change of the power supply voltage of a phase comparator of a phase-locked loop PLL circuit according to the frequency dividing ratio. CONSTITUTION:A voltage controlling circuit 6 is connected to a variable frequency divider 2 of a PLL circuit. The circuit 6 recevies a signal applied to program terminals P0-P3 of a frequency divider 2 to deliver the signal of voltage VDD' to a phase comparator 3. The voltage VDD' is proportional to the frequency dividing ratio N, the sensitivity of the comparator 3 is proportional to the voltage VDD' and the loop gain is proportional to a prescribed sensitivity of a voltage controlled oscillator 5, then the loop gain is constant independently of the frequency ratio. Thus, even if the change in the frequency dividing ratio N is made greater, the loop stability can not be lost, the high-speed operation request to components can be eliminated and the manufacturing cost of the PLL circuit as a frequency synthesizer can be decreased.
JP55119838A 1980-09-01 1980-09-01 Phase-locked loop circuit Pending JPS5745730A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55119838A JPS5745730A (en) 1980-09-01 1980-09-01 Phase-locked loop circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55119838A JPS5745730A (en) 1980-09-01 1980-09-01 Phase-locked loop circuit

Publications (1)

Publication Number Publication Date
JPS5745730A true JPS5745730A (en) 1982-03-15

Family

ID=14771501

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55119838A Pending JPS5745730A (en) 1980-09-01 1980-09-01 Phase-locked loop circuit

Country Status (1)

Country Link
JP (1) JPS5745730A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5848145U (en) * 1981-09-28 1983-03-31 沖電気工業株式会社 phase synchronized circuit
JPS6069916A (en) * 1983-09-26 1985-04-20 Pioneer Electronic Corp Phase locked loop circuit
US4568888A (en) * 1983-11-08 1986-02-04 Trw Inc. PLL Fast frequency synthesizer with memories for coarse tuning and loop gain correction

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5848145U (en) * 1981-09-28 1983-03-31 沖電気工業株式会社 phase synchronized circuit
JPS6069916A (en) * 1983-09-26 1985-04-20 Pioneer Electronic Corp Phase locked loop circuit
US4568888A (en) * 1983-11-08 1986-02-04 Trw Inc. PLL Fast frequency synthesizer with memories for coarse tuning and loop gain correction

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