JPS5792902A - Fm modulator - Google Patents

Fm modulator

Info

Publication number
JPS5792902A
JPS5792902A JP16752280A JP16752280A JPS5792902A JP S5792902 A JPS5792902 A JP S5792902A JP 16752280 A JP16752280 A JP 16752280A JP 16752280 A JP16752280 A JP 16752280A JP S5792902 A JPS5792902 A JP S5792902A
Authority
JP
Japan
Prior art keywords
varactor diode
capacity
low
pass filter
influence
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
JP16752280A
Other languages
Japanese (ja)
Inventor
Masato Hosobuchi
Hideo Kaneoka
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP16752280A priority Critical patent/JPS5792902A/en
Publication of JPS5792902A publication Critical patent/JPS5792902A/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
    • H03C3/12—Angle modulation by means of variable impedance by means of a variable reactive element
    • H03C3/22—Angle modulation by means of variable impedance by means of a variable reactive element the element being a semiconductor diode, e.g. varicap diode
    • H03C3/222—Angle modulation by means of variable impedance by means of a variable reactive element the element being a semiconductor diode, e.g. varicap diode using bipolar transistors

Landscapes

  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To reduce the influence of a low-pass filter, by inserting another varactor diode between the output side of the low-pass filter, to which an input signal is applied, and a varactor diode. CONSTITUTION:The input signal applied to an input terminal 1 is applied to a varactor diode 7 through a low-pass filter 17 to change the oscillation frequency of a carrier oscillator 19. At this time, the capacity of a varactor diode 21 changes in the same direction as the change of the capacity of the varactor diode 7, and therefore, the influence of the filter 17 due to a capacity 6 is reduced.
JP16752280A 1980-11-28 1980-11-28 Fm modulator Pending JPS5792902A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16752280A JPS5792902A (en) 1980-11-28 1980-11-28 Fm modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16752280A JPS5792902A (en) 1980-11-28 1980-11-28 Fm modulator

Publications (1)

Publication Number Publication Date
JPS5792902A true JPS5792902A (en) 1982-06-09

Family

ID=15851250

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16752280A Pending JPS5792902A (en) 1980-11-28 1980-11-28 Fm modulator

Country Status (1)

Country Link
JP (1) JPS5792902A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5075644A (en) * 1990-12-03 1991-12-24 Motorola, Inc. Voltage controlled oscillator with filtered and compensated modulation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5075644A (en) * 1990-12-03 1991-12-24 Motorola, Inc. Voltage controlled oscillator with filtered and compensated modulation

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