JPS5585147A - Frequency synthesizer - Google Patents

Frequency synthesizer

Info

Publication number
JPS5585147A
JPS5585147A JP15691178A JP15691178A JPS5585147A JP S5585147 A JPS5585147 A JP S5585147A JP 15691178 A JP15691178 A JP 15691178A JP 15691178 A JP15691178 A JP 15691178A JP S5585147 A JPS5585147 A JP S5585147A
Authority
JP
Japan
Prior art keywords
frequency
oscillator
output
control input
fed
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
JP15691178A
Other languages
Japanese (ja)
Other versions
JPS5853803B2 (en
Inventor
Takenori Kurihara
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.)
Advantest Corp
Original Assignee
Advantest Corp
Takeda Riken Industries 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 Advantest Corp, Takeda Riken Industries Co Ltd filed Critical Advantest Corp
Priority to JP53156911A priority Critical patent/JPS5853803B2/en
Publication of JPS5585147A publication Critical patent/JPS5585147A/en
Publication of JPS5853803B2 publication Critical patent/JPS5853803B2/en
Expired 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

Landscapes

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

Abstract

PURPOSE:To reduce the single side band noise resulted from frequency division, by differentiating the control input to the variable frequency oscillator and taking it as the control input of the variable frequency local oscillator. CONSTITUTION:The output of the variable frequency oscillator Ov and the variable frequency local oscillator Ol is fed to the mixer M and the frequency output of the sum or difference is obtained. The output of the oscillator Ov is fed to the frequency divider N to produce the frequency of 1/N. Phase or frequency comparison is made with the output of the reference oscillator Os at the frequency comparator P. The output of the comparator P is taken as the control input of the oscillator Ov and it is fed to the differentiator D. In the differentiator D, the single side band wave noise due to N frequency division is picked up and fed as the control input of the oscillator Ol. The frequency change due to noise component at the control input of the oscillator Ov is equal to the frequency variation of the oscillator Ol. Accordingly, the polarity adjustment of the amplifier A2 can prevent the frequency variation at the output of the mixer M due to noise component.
JP53156911A 1978-12-21 1978-12-21 frequency synthesizer Expired JPS5853803B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53156911A JPS5853803B2 (en) 1978-12-21 1978-12-21 frequency synthesizer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53156911A JPS5853803B2 (en) 1978-12-21 1978-12-21 frequency synthesizer

Publications (2)

Publication Number Publication Date
JPS5585147A true JPS5585147A (en) 1980-06-26
JPS5853803B2 JPS5853803B2 (en) 1983-12-01

Family

ID=15638069

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53156911A Expired JPS5853803B2 (en) 1978-12-21 1978-12-21 frequency synthesizer

Country Status (1)

Country Link
JP (1) JPS5853803B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5994104U (en) * 1982-12-15 1984-06-26 スズキ株式会社 engine oil pan

Also Published As

Publication number Publication date
JPS5853803B2 (en) 1983-12-01

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