JPS54119867A - Frequency synthesizer - Google Patents

Frequency synthesizer

Info

Publication number
JPS54119867A
JPS54119867A JP2732078A JP2732078A JPS54119867A JP S54119867 A JPS54119867 A JP S54119867A JP 2732078 A JP2732078 A JP 2732078A JP 2732078 A JP2732078 A JP 2732078A JP S54119867 A JPS54119867 A JP S54119867A
Authority
JP
Japan
Prior art keywords
frequency
phase
output
ndeltafsp
lowering
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
JP2732078A
Other languages
Japanese (ja)
Inventor
Takashi Matsuura
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP2732078A priority Critical patent/JPS54119867A/en
Publication of JPS54119867A publication Critical patent/JPS54119867A/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
    • H03L2207/10—Indirect frequency synthesis using a frequency multiplier in the phase-locked loop or in the reference signal path

Abstract

PURPOSE:To constitute the phase synchronizing loop frequency synthesizer without lowering the cut-off frequency of the phase synchronizing loop circuit. CONSTITUTION:After the output frequency f0 of the voltage controlled oscillator 5 changing its output frequency in response to the output of LPF 4 is multiplied by n 7(where: n is a positive integer.)it is variably demultiplied into 1/N and further into nf0/N. When this is in phase comparison 3 with the frequency nDELTAfSP demultiplying the frequency of the reference oscillator 1 with the fixed demultiplier 8, since the both input frequencies are equal, the frequency is f0=NXDELTAfSP, and when the value of N is changed, multi-frequency integer number times DELTAfSP is obtained. Further, since the comparison frequency of the phase comparator 3 is nDELTAfSP, excellent frequency synthesizer can be constituted without lowering the cut-off frequency of the phase control loop including LPF4.
JP2732078A 1978-03-09 1978-03-09 Frequency synthesizer Pending JPS54119867A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2732078A JPS54119867A (en) 1978-03-09 1978-03-09 Frequency synthesizer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2732078A JPS54119867A (en) 1978-03-09 1978-03-09 Frequency synthesizer

Publications (1)

Publication Number Publication Date
JPS54119867A true JPS54119867A (en) 1979-09-18

Family

ID=12217777

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2732078A Pending JPS54119867A (en) 1978-03-09 1978-03-09 Frequency synthesizer

Country Status (1)

Country Link
JP (1) JPS54119867A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4516083A (en) * 1982-05-14 1985-05-07 Motorola, Inc. Fast lock PLL having out of lock detector control of loop filter and divider

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4516083A (en) * 1982-05-14 1985-05-07 Motorola, Inc. Fast lock PLL having out of lock detector control of loop filter and divider

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