JPS5555608A - Automatic gain control circuit - Google Patents

Automatic gain control circuit

Info

Publication number
JPS5555608A
JPS5555608A JP12880178A JP12880178A JPS5555608A JP S5555608 A JPS5555608 A JP S5555608A JP 12880178 A JP12880178 A JP 12880178A JP 12880178 A JP12880178 A JP 12880178A JP S5555608 A JPS5555608 A JP S5555608A
Authority
JP
Japan
Prior art keywords
gain control
bias current
amplifiers
control circuit
automatic gain
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.)
Granted
Application number
JP12880178A
Other languages
Japanese (ja)
Other versions
JPS6221285B2 (en
Inventor
Eiichi Matsumura
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP12880178A priority Critical patent/JPS5555608A/en
Publication of JPS5555608A publication Critical patent/JPS5555608A/en
Publication of JPS6221285B2 publication Critical patent/JPS6221285B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To enable to set the gain control amount to an arbitrary given value, by providing the bias supply circuit feeding the bias current to the first and second differential amplifiers and suitably selecting the bias current and resistance value of the amplifiers. CONSTITUTION:The signal from the signal source S is fed to the first differential amplifier consisting of the transistors TrQ1, Q2 via the capacitor C1 and the second differential amplifier consisting of TrQ3, Q4 respectively to produce the control voltage from the load RL. Further, the bias supply circuit b feeding bias current to the first and second differential amplifiers respectively is provided and the value of resistors R6 and R7 and the bias current of the amplifiers are suitably selected, allowing to set the gain control amount of a given value.
JP12880178A 1978-10-19 1978-10-19 Automatic gain control circuit Granted JPS5555608A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12880178A JPS5555608A (en) 1978-10-19 1978-10-19 Automatic gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12880178A JPS5555608A (en) 1978-10-19 1978-10-19 Automatic gain control circuit

Publications (2)

Publication Number Publication Date
JPS5555608A true JPS5555608A (en) 1980-04-23
JPS6221285B2 JPS6221285B2 (en) 1987-05-12

Family

ID=14993760

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12880178A Granted JPS5555608A (en) 1978-10-19 1978-10-19 Automatic gain control circuit

Country Status (1)

Country Link
JP (1) JPS5555608A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210122359A (en) 2020-03-30 2021-10-12 삼성디스플레이 주식회사 Display device and manufacturing method for the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS537139U (en) * 1976-07-02 1978-01-21
JPS5334446A (en) * 1976-09-10 1978-03-31 Matsushita Electric Ind Co Ltd Automatic gain control circuit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS537139B2 (en) * 1974-04-08 1978-03-15

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS537139U (en) * 1976-07-02 1978-01-21
JPS5334446A (en) * 1976-09-10 1978-03-31 Matsushita Electric Ind Co Ltd Automatic gain control circuit

Also Published As

Publication number Publication date
JPS6221285B2 (en) 1987-05-12

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