JPS54116870A - Automatic gain control circuit of amplifier - Google Patents

Automatic gain control circuit of amplifier

Info

Publication number
JPS54116870A
JPS54116870A JP2433578A JP2433578A JPS54116870A JP S54116870 A JPS54116870 A JP S54116870A JP 2433578 A JP2433578 A JP 2433578A JP 2433578 A JP2433578 A JP 2433578A JP S54116870 A JPS54116870 A JP S54116870A
Authority
JP
Japan
Prior art keywords
signal
input
signal group
amplifier
level
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
JP2433578A
Other languages
Japanese (ja)
Inventor
Yoshihiro Nagata
Masaru Kamimura
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2433578A priority Critical patent/JPS54116870A/en
Publication of JPS54116870A publication Critical patent/JPS54116870A/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 without distortion of the input signal
    • 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

Abstract

PURPOSE:To make it possible to keep the output of an AGC circuit constant by controlling the gain of an amplifier by switching capacitors of an input level detector synchronizing with the input of each signal group. CONSTITUTION:Switching signal generator 13 generates a switching signal from a time-division input signal group and by this signal, analog switch 12 is controlled to change over sequentially capacitors 6a to 6c of input level detector 8 synchronizing with each input signal group. As a result, each capacitor is charged at the level of a corresponding signal group under no influence of any other signal group and by this voltage, gain control amplifier 2 is controlled. Therefore, even if each level of signal groups is different and varies independently, the output of the AGC circuit can be held at a constant level.
JP2433578A 1978-03-02 1978-03-02 Automatic gain control circuit of amplifier Pending JPS54116870A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2433578A JPS54116870A (en) 1978-03-02 1978-03-02 Automatic gain control circuit of amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2433578A JPS54116870A (en) 1978-03-02 1978-03-02 Automatic gain control circuit of amplifier

Publications (1)

Publication Number Publication Date
JPS54116870A true JPS54116870A (en) 1979-09-11

Family

ID=12135304

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2433578A Pending JPS54116870A (en) 1978-03-02 1978-03-02 Automatic gain control circuit of amplifier

Country Status (1)

Country Link
JP (1) JPS54116870A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5690689A (en) * 1979-12-24 1981-07-22 Sony Corp Signal processing circuit for dot-sequential image pickup output signal
JPS58121417U (en) * 1982-01-11 1983-08-18 八重洲無線株式会社 AGC time constant switching circuit
JPS6048608A (en) * 1983-08-29 1985-03-16 Yaesu Musen Co Ltd Alc circuit
JPH0272707A (en) * 1988-09-08 1990-03-13 Matsushita Electric Ind Co Ltd Automatic amplitude setting circuit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5690689A (en) * 1979-12-24 1981-07-22 Sony Corp Signal processing circuit for dot-sequential image pickup output signal
JPS58121417U (en) * 1982-01-11 1983-08-18 八重洲無線株式会社 AGC time constant switching circuit
JPH021947Y2 (en) * 1982-01-11 1990-01-18
JPS6048608A (en) * 1983-08-29 1985-03-16 Yaesu Musen Co Ltd Alc circuit
JPH025043B2 (en) * 1983-08-29 1990-01-31 Yaesu Musen Kk
JPH0272707A (en) * 1988-09-08 1990-03-13 Matsushita Electric Ind Co Ltd Automatic amplitude setting circuit

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