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JPS6489620A - N-fraction type frequency synthesizer - Google Patents

N-fraction type frequency synthesizer

Info

Publication number
JPS6489620A
JPS6489620A JP62243846A JP24384687A JPS6489620A JP S6489620 A JPS6489620 A JP S6489620A JP 62243846 A JP62243846 A JP 62243846A JP 24384687 A JP24384687 A JP 24384687A JP S6489620 A JPS6489620 A JP S6489620A
Authority
JP
Japan
Prior art keywords
divider
frequency
signal
output
oscillator
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
JP62243846A
Other languages
Japanese (ja)
Inventor
Masashige Suzuki
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 Ltd
Hitachi Information Technology Co Ltd
Original Assignee
Hitachi Ltd
Hitachi Communication Systems Inc
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 Ltd, Hitachi Communication Systems Inc filed Critical Hitachi Ltd
Priority to JP62243846A priority Critical patent/JPS6489620A/en
Publication of JPS6489620A publication Critical patent/JPS6489620A/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
    • H03L7/197—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 numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division

Landscapes

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

Abstract

PURPOSE:To remove a spurious radiation to be generated by an N-fraction type divider and to obtain the frequency synthesizer of a low noise without the degradation of a phase noise by providing a voltage control type band filter to the rear step of the N-fraction type divider. CONSTITUTION:An output signal 8 of a voltage control oscillator 4 is divided with being time-serially switched to the integer number of a dividing ratio by an N-fraction type divider 5. The frequency step of the output signal 8 to a reference signal 1 depends on this switching timing. By the switching of the dividing ratio, the spurious radiation is generated in the output signal of the divider 5 with a frequency interval by relation between the frequency of the signal 1 and the switching timing. A voltage control band filter 6 causes only a frequency component which corresponds to the dividing ratio of the divider 5 of the output frequency of the oscillator 4, to pass through out of the output signals of the divider 5 and the other spurious radiation is inter rupted. The output of the filter 6 is phase-compared with the signal 1 by a phase comparator 2 and a voltage to correspond to a phase difference is outputted. Further, a direct current component is extracted by a loop filter 3 and goes to be the control voltage of the oscillator 4.
JP62243846A 1987-09-30 1987-09-30 N-fraction type frequency synthesizer Pending JPS6489620A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62243846A JPS6489620A (en) 1987-09-30 1987-09-30 N-fraction type frequency synthesizer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62243846A JPS6489620A (en) 1987-09-30 1987-09-30 N-fraction type frequency synthesizer

Publications (1)

Publication Number Publication Date
JPS6489620A true JPS6489620A (en) 1989-04-04

Family

ID=17109819

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62243846A Pending JPS6489620A (en) 1987-09-30 1987-09-30 N-fraction type frequency synthesizer

Country Status (1)

Country Link
JP (1) JPS6489620A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012505609A (en) * 2008-10-08 2012-03-01 クゥアルコム・インコーポレイテッド Clock cleanup phase lock loop (PLL)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012505609A (en) * 2008-10-08 2012-03-01 クゥアルコム・インコーポレイテッド Clock cleanup phase lock loop (PLL)
JP2015092671A (en) * 2008-10-08 2015-05-14 クゥアルコム・インコーポレイテッドＱｕａｌｃｏｍｍ Ｉｎｃｏｒｐｏｒａｔｅｄ Clock clean-up phase-locked loop (PLL)
JP2017063439A (en) * 2008-10-08 2017-03-30 クゥアルコム・インコーポレイテッドＱｕａｌｃｏｍｍ Ｉｎｃｏｒｐｏｒａｔｅｄ Clock clean-up phase-locked loop (pll)

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SCHILLING Optimal space communications techniques(using digital and phase locked systems for signal processing)[Final Report, 22 Jan. 1973- 21 Jan. 1974]