JPS57184310A - Automatic gain controlling circuit - Google Patents

Automatic gain controlling circuit

Info

Publication number
JPS57184310A
JPS57184310A JP6981281A JP6981281A JPS57184310A JP S57184310 A JPS57184310 A JP S57184310A JP 6981281 A JP6981281 A JP 6981281A JP 6981281 A JP6981281 A JP 6981281A JP S57184310 A JPS57184310 A JP S57184310A
Authority
JP
Japan
Prior art keywords
impedance
input signal
amplifier
voltage
resistance
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
JP6981281A
Other languages
Japanese (ja)
Inventor
Yuichi Nagata
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.)
Nippon Gakki Co Ltd
Original Assignee
Nippon Gakki 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 Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
Priority to JP6981281A priority Critical patent/JPS57184310A/en
Publication of JPS57184310A publication Critical patent/JPS57184310A/en
Pending 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
    • H03G3/301—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable
    • H03G3/3015—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable using diodes or transistors

Landscapes

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

Abstract

PURPOSE:To reduce the noise caused by the even order distortion and the instantaneous large input, by connecting the semiconductor amplifying elements in parallel with the conducting directions set opposite to each other to form a variable impedance which divides the voltage of an input signal. CONSTITUTION:The voltage of the input signal applied to a signal input terminal 1 is divided by a series circuit consisting of a resistance 3 and a variable impedance circuit 5. The input signal is amplified by an amplifier 2 and then delivered through a terminal 6 via a capacitor 9 and a resistance 10. The impedance 5 contains transistors 5a and 5b having the polarities opposite to each other and connected in parallel with the conducting directions set opposite to each other. The impedance 5 is controlled by level detecting circuit 7a and 7b that detect the levels of the positive and negative signals contained in the output of the amplifier 2 in the form of the corresponding positive and negative voltages.
JP6981281A 1981-05-09 1981-05-09 Automatic gain controlling circuit Pending JPS57184310A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6981281A JPS57184310A (en) 1981-05-09 1981-05-09 Automatic gain controlling circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6981281A JPS57184310A (en) 1981-05-09 1981-05-09 Automatic gain controlling circuit

Publications (1)

Publication Number Publication Date
JPS57184310A true JPS57184310A (en) 1982-11-13

Family

ID=13413538

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6981281A Pending JPS57184310A (en) 1981-05-09 1981-05-09 Automatic gain controlling circuit

Country Status (1)

Country Link
JP (1) JPS57184310A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6451812A (en) * 1987-08-24 1989-02-28 Matsushita Electric Ind Co Ltd Agc circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6451812A (en) * 1987-08-24 1989-02-28 Matsushita Electric Ind Co Ltd Agc circuit

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