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JPS5625809A - Automatic gain control circuit for amplitude modulator - Google Patents

Automatic gain control circuit for amplitude modulator

Info

Publication number
JPS5625809A
JPS5625809A JP10161479A JP10161479A JPS5625809A JP S5625809 A JPS5625809 A JP S5625809A JP 10161479 A JP10161479 A JP 10161479A JP 10161479 A JP10161479 A JP 10161479A JP S5625809 A JPS5625809 A JP S5625809A
Authority
JP
Japan
Prior art keywords
gain
modulation
amplitude modulator
mutual conductance
control 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
JP10161479A
Other languages
Japanese (ja)
Inventor
Tsuguo Otsuki
Tadashi Yoshikawa
Masao Takeda
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 JP10161479A priority Critical patent/JPS5625809A/en
Publication of JPS5625809A publication Critical patent/JPS5625809A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0017—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier
    • H03G1/0023—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier in emitter-coupled or cascode amplifiers

Landscapes

  • Amplitude Modulation (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To automatically control the gain of modulation circuit, by controlling mutual conductance of transistor located in the differential amplifying type modulation circuit in composition. CONSTITUTION:The block 4 is the blanced modulation section of multiplier type, and when the points P1, P2 are taken as the balanced output terminals of amplitude modulator, the carrier is not appeared by suppression. The block 6 is the constant current circuit consisting of transistors (TR)Q7, Q8 and Q9, and when the control voltage Vc is given to the terminal 9, the bias current indicated with Io is changed to change the mutual conductance of TRsQ5 and Q6. Since the gain of modulation circuit is proportional to this mutual conductance, the modulation gain can continuously be controlled with the control voltage Vc.
JP10161479A 1979-08-09 1979-08-09 Automatic gain control circuit for amplitude modulator Pending JPS5625809A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10161479A JPS5625809A (en) 1979-08-09 1979-08-09 Automatic gain control circuit for amplitude modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10161479A JPS5625809A (en) 1979-08-09 1979-08-09 Automatic gain control circuit for amplitude modulator

Publications (1)

Publication Number Publication Date
JPS5625809A true JPS5625809A (en) 1981-03-12

Family

ID=14305271

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10161479A Pending JPS5625809A (en) 1979-08-09 1979-08-09 Automatic gain control circuit for amplitude modulator

Country Status (1)

Country Link
JP (1) JPS5625809A (en)

Cited By (1)

* 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

Cited By (1)

* 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

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