JPS5651133A - Frequency synthesizer - Google Patents

Frequency synthesizer

Info

Publication number
JPS5651133A
JPS5651133A JP12763879A JP12763879A JPS5651133A JP S5651133 A JPS5651133 A JP S5651133A JP 12763879 A JP12763879 A JP 12763879A JP 12763879 A JP12763879 A JP 12763879A JP S5651133 A JPS5651133 A JP S5651133A
Authority
JP
Japan
Prior art keywords
frequency
circuit
vco
divided
phase
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
JP12763879A
Other languages
Japanese (ja)
Other versions
JPS6051290B2 (en
Inventor
Hitoshi Takizawa
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP54127638A priority Critical patent/JPS6051290B2/en
Publication of JPS5651133A publication Critical patent/JPS5651133A/en
Publication of JPS6051290B2 publication Critical patent/JPS6051290B2/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
    • H03L7/22—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop
    • H03L7/23—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop with pulse counters or frequency dividers

Abstract

PURPOSE:To make a frequency synthesizer wide-band, by constituting the frequency synthesizer so that the lock frequency range of the voltage control oscillating circuit where the output frequency is supplied can be extended. CONSTITUTION:Oscillation frequency f1 of voltage control oscillating circuit (VCO) 5 is divided by variable frquency divising circuit 6 and is compared with reference frequency fR in phase and is applied to VCO 5 through low-pass filter 4 to control oscillation frequency f1. Frequency f1 is divided by frequency dividing circuit 7 and is caused to pass through pulse position modulating circuit 8 to obtain reference frequency f2 of phase comparing circuit 9. Oscillation frequency f0 of VCO 11 is divided by frequency dividing circuit 12 and is compared with f2 in phase and is applied to VCO 11 through low-pass filter 10 to control oscillation frequency f0. If fR is so selected that fR=(K/M).(channel interval frequency) (wherein K and M are frequency dividing numbers of frequency dividing circuits 7 and 12 respectively) may be satisfied, f0 can be set to an arbitrary channel frequency by changing the frequqncy division ratio of variable frequency dividing circuit 6.
JP54127638A 1979-10-02 1979-10-02 frequency synthesizer Expired JPS6051290B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54127638A JPS6051290B2 (en) 1979-10-02 1979-10-02 frequency synthesizer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54127638A JPS6051290B2 (en) 1979-10-02 1979-10-02 frequency synthesizer

Publications (2)

Publication Number Publication Date
JPS5651133A true JPS5651133A (en) 1981-05-08
JPS6051290B2 JPS6051290B2 (en) 1985-11-13

Family

ID=14965040

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54127638A Expired JPS6051290B2 (en) 1979-10-02 1979-10-02 frequency synthesizer

Country Status (1)

Country Link
JP (1) JPS6051290B2 (en)

Also Published As

Publication number Publication date
JPS6051290B2 (en) 1985-11-13

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