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JPS5668004A - Fm modulating circuit - Google Patents

Fm modulating circuit

Info

Publication number
JPS5668004A
JPS5668004A JP14477579A JP14477579A JPS5668004A JP S5668004 A JPS5668004 A JP S5668004A JP 14477579 A JP14477579 A JP 14477579A JP 14477579 A JP14477579 A JP 14477579A JP S5668004 A JPS5668004 A JP S5668004A
Authority
JP
Japan
Prior art keywords
output
amplifier
divider
output terminal
circuit
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
JP14477579A
Other languages
Japanese (ja)
Inventor
Kensaku Abe
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP14477579A priority Critical patent/JPS5668004A/en
Publication of JPS5668004A publication Critical patent/JPS5668004A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/02—Details
    • H03C3/09—Modifications of modulator for regulating the mean frequency
    • H03C3/0908—Modifications of modulator for regulating the mean frequency using a phase locked loop
    • H03C3/0958—Modifications of modulator for regulating the mean frequency using a phase locked loop applying frequency modulation by varying the characteristics of the voltage controlled oscillator

Landscapes

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

Abstract

PURPOSE:To improve FM modulation and to shorten set time by temporarily decreasing the time constant of a low-pass filter connected to a voltage control oscillator when the electric power source is put to work or when the frequency- dividing ratio of a variable frequency divider is varied. CONSTITUTION:The FM modulating circuit is provided with voltage control type oscillator 1 composed of FET having the gate connecting with varactor diode 10 and an output signal appearing one output terminal 2a of it is supplied via prescaler 3 to programmable divider 4 whose dividing ratio can be changed by setting switch 11. Next, its output is applied to phase comparator 7, to which differentiating circuit 18, reference oscillator 5, fixed frequency divider 6, etc., are connected, to make a comparison with the output of divider 4 and its output is applied to low- pass filter 8 connecting with circuit 18, thereby applying amplifier 1 with its output as a control voltage with the time constant varied. Then, an FM-modulated signal appearing at the other output terminal 2b of amplifier 1 is applied to amplifier 14, whose output is sent out via output terminal 15.
JP14477579A 1979-11-08 1979-11-08 Fm modulating circuit Pending JPS5668004A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14477579A JPS5668004A (en) 1979-11-08 1979-11-08 Fm modulating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14477579A JPS5668004A (en) 1979-11-08 1979-11-08 Fm modulating circuit

Publications (1)

Publication Number Publication Date
JPS5668004A true JPS5668004A (en) 1981-06-08

Family

ID=15370133

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14477579A Pending JPS5668004A (en) 1979-11-08 1979-11-08 Fm modulating circuit

Country Status (1)

Country Link
JP (1) JPS5668004A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6370716U (en) * 1986-10-27 1988-05-12
JPS63165931U (en) * 1987-04-17 1988-10-28
JPS63169723U (en) * 1987-04-20 1988-11-04
JPH0165528U (en) * 1987-10-20 1989-04-26
JPH01160141A (en) * 1987-12-16 1989-06-23 Hochiki Corp data transmission equipment
JPH0265411A (en) * 1988-08-31 1990-03-06 Matsushita Electric Ind Co Ltd Pll circuit and cordless telephone set
JP2650492B2 (en) * 1990-07-16 1997-09-03 モトローラ・インコーポレイテッド Fractional-N synthesizer with modulation spurious compensation

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6370716U (en) * 1986-10-27 1988-05-12
JPS63165931U (en) * 1987-04-17 1988-10-28
JPS63169723U (en) * 1987-04-20 1988-11-04
JPH0165528U (en) * 1987-10-20 1989-04-26
JPH01160141A (en) * 1987-12-16 1989-06-23 Hochiki Corp data transmission equipment
JPH0265411A (en) * 1988-08-31 1990-03-06 Matsushita Electric Ind Co Ltd Pll circuit and cordless telephone set
JP2650492B2 (en) * 1990-07-16 1997-09-03 モトローラ・インコーポレイテッド Fractional-N synthesizer with modulation spurious compensation

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