JPS56149803A - Modulating circuit - Google Patents

Modulating circuit

Info

Publication number
JPS56149803A
JPS56149803A JP5378680A JP5378680A JPS56149803A JP S56149803 A JPS56149803 A JP S56149803A JP 5378680 A JP5378680 A JP 5378680A JP 5378680 A JP5378680 A JP 5378680A JP S56149803 A JPS56149803 A JP S56149803A
Authority
JP
Japan
Prior art keywords
trs
disturbance
signal
base
impedance
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
JP5378680A
Other languages
Japanese (ja)
Inventor
Tsuguo Otsuki
Mikio Murozaki
Yoshio Takekoshi
Kazuo Sato
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 JP5378680A priority Critical patent/JPS56149803A/en
Publication of JPS56149803A publication Critical patent/JPS56149803A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
    • H03C1/54—Balanced modulators, e.g. bridge type, ring type or double balanced type
    • H03C1/542—Balanced modulators, e.g. bridge type, ring type or double balanced type comprising semiconductor devices with at least three electrodes
    • H03C1/545—Balanced modulators, e.g. bridge type, ring type or double balanced type comprising semiconductor devices with at least three electrodes using bipolar transistors

Landscapes

  • Amplitude Modulation (AREA)

Abstract

PURPOSE:To remove a single sound disturbance by providing the balanced impedance of the modulating signal source, on the modulating circuit for obtaining a single side-band wave, in the carrier broadcasting equipment, etc., and suppressing a disturbance signal caused by the external electric power source. CONSTITUTION:A carrier signal fc is provided to the terminal 1 of the transistors TR1-4 which have been bridge-connected. Also, TRs 5, 6 having the emitters of TRs 1, 2 and the emitters of TRs 3, 4 connected to respective collectors form a differential amplifier, and to this differential amplifier is connected the constant current source consisting of TRs 7, 8. On the other hand, the blancing impedance Z' which is equal to the impedance which has viewed the modulating signal source from the base (a) of TR5 is connected to the base (b) of TR6. According to such connection, the disturbance signal voltage applied to the base (a) and (b) points becomes equal by the low-frequency voltage at the point (c) of the voltage divider for supplying the bias voltage to TRs 5, 6. Accordingly, the disturbance signal is suppressed and the single sound disturbance can be removed.
JP5378680A 1980-04-23 1980-04-23 Modulating circuit Pending JPS56149803A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5378680A JPS56149803A (en) 1980-04-23 1980-04-23 Modulating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5378680A JPS56149803A (en) 1980-04-23 1980-04-23 Modulating circuit

Publications (1)

Publication Number Publication Date
JPS56149803A true JPS56149803A (en) 1981-11-19

Family

ID=12952493

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5378680A Pending JPS56149803A (en) 1980-04-23 1980-04-23 Modulating circuit

Country Status (1)

Country Link
JP (1) JPS56149803A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4654607A (en) * 1985-01-31 1987-03-31 Sony Corporation Modulation control circuit for an amplitude modulator
US5514950A (en) * 1993-03-16 1996-05-07 Alcatel N.V. Differential pair arrangement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4654607A (en) * 1985-01-31 1987-03-31 Sony Corporation Modulation control circuit for an amplitude modulator
US5514950A (en) * 1993-03-16 1996-05-07 Alcatel N.V. Differential pair arrangement

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