JPS5784603A - Frequency modulating circuit - Google Patents

Frequency modulating circuit

Info

Publication number
JPS5784603A
JPS5784603A JP16159680A JP16159680A JPS5784603A JP S5784603 A JPS5784603 A JP S5784603A JP 16159680 A JP16159680 A JP 16159680A JP 16159680 A JP16159680 A JP 16159680A JP S5784603 A JPS5784603 A JP S5784603A
Authority
JP
Japan
Prior art keywords
modulation
circuit
degree
feedback
capacitors
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
JP16159680A
Other languages
Japanese (ja)
Inventor
Masaharu Ishida
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.)
Rohm Co Ltd
Original Assignee
Rohm Co Ltd
Toyo Electronics Industry 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 Rohm Co Ltd, Toyo Electronics Industry Corp filed Critical Rohm Co Ltd
Priority to JP16159680A priority Critical patent/JPS5784603A/en
Publication of JPS5784603A publication Critical patent/JPS5784603A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/10—Angle modulation by means of variable impedance
    • H03C3/24—Angle modulation by means of variable impedance by means of a variable resistive element, e.g. tube

Landscapes

  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Amplitude Modulation (AREA)

Abstract

PURPOSE:To remarkably suppress the dispersion in the degree of modulation and to enable nonmodulation of the degree of modulation, by returning a feedback signal for oscillation to a connecting point between a circuit converting a modulation signal into a current and a transistor. CONSTITUTION:A conversion output of a current conversion circuit 22 is applied from the collector of a transistor TR24 to a TR2, and the gm of the TR2 is changed. As a result, the oscillating frequency of an oscillation circuit having a feedback loop consisting of a tank circuit with a capacitor C and a coil 16, TR2 and capacitors 18, 20 is changed and a frequency modulation output can be obtained. Since a feedback signal from a capacitor 14 and the coil 16 is returned to a connecting point between the TRs 2 and 24 which are not subjected to the effect of a resistance value, the amount of feedback can be decided only with the impedance value of the capacitors 18, 20. Thus, the dispersion in the degree of modulation due to the resistance value can be suppressed remarkably as conventional cases, adjustment of the degree of modulation can not be achieved, and the circuit is most suited to circuit integration.
JP16159680A 1980-11-17 1980-11-17 Frequency modulating circuit Pending JPS5784603A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16159680A JPS5784603A (en) 1980-11-17 1980-11-17 Frequency modulating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16159680A JPS5784603A (en) 1980-11-17 1980-11-17 Frequency modulating circuit

Publications (1)

Publication Number Publication Date
JPS5784603A true JPS5784603A (en) 1982-05-27

Family

ID=15738142

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16159680A Pending JPS5784603A (en) 1980-11-17 1980-11-17 Frequency modulating circuit

Country Status (1)

Country Link
JP (1) JPS5784603A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03206703A (en) * 1990-01-08 1991-09-10 Matsushita Electric Ind Co Ltd Modulation circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4727471U (en) * 1971-04-15 1972-11-28

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4727471U (en) * 1971-04-15 1972-11-28

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03206703A (en) * 1990-01-08 1991-09-10 Matsushita Electric Ind Co Ltd Modulation circuit

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