JPS6451812A - Agc circuit - Google Patents

Agc circuit

Info

Publication number
JPS6451812A
JPS6451812A JP20966487A JP20966487A JPS6451812A JP S6451812 A JPS6451812 A JP S6451812A JP 20966487 A JP20966487 A JP 20966487A JP 20966487 A JP20966487 A JP 20966487A JP S6451812 A JPS6451812 A JP S6451812A
Authority
JP
Japan
Prior art keywords
amplifier
agc
signal
potential
terminal
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
JP20966487A
Other languages
Japanese (ja)
Inventor
Yasuhiro Kamatani
Yasuo Higuchi
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP20966487A priority Critical patent/JPS6451812A/en
Publication of JPS6451812A publication Critical patent/JPS6451812A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To prevent a DC potential fluctuation of a signal transmission line by providing an impedance variable circuit changing the impedance by an AGC signal but not fluctuating the DC potential to the input side of the amplifier. CONSTITUTION:The signal to be sent is given from an input terminal 1 to the amplifier 5 and then amplified and sent to the post-stage from an output terminal 6. The output signal of the amplifier 5 is fed also to a detection circuit 22 and the AGC signal in response to the output level of the amplifier 5 is fed to bases of transistors 15, 16 of the impedance variable circuit 29. When the output level of the amplifier 5 is large and the AGC is in the operating state, the potential at a terminal 21 is equal to the reference voltage nearly from the reference voltage generating circuit 11. Thus, the DC potential at the terminal 21 is not fluctuated between the AGC operation and AGC nonoperation.
JP20966487A 1987-08-24 1987-08-24 Agc circuit Pending JPS6451812A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20966487A JPS6451812A (en) 1987-08-24 1987-08-24 Agc circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20966487A JPS6451812A (en) 1987-08-24 1987-08-24 Agc circuit

Publications (1)

Publication Number Publication Date
JPS6451812A true JPS6451812A (en) 1989-02-28

Family

ID=16576560

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20966487A Pending JPS6451812A (en) 1987-08-24 1987-08-24 Agc circuit

Country Status (1)

Country Link
JP (1) JPS6451812A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57173213A (en) * 1981-04-16 1982-10-25 Matsushita Electric Ind Co Ltd Muting circuit
JPS57184310A (en) * 1981-05-09 1982-11-13 Nippon Gakki Seizo Kk Automatic gain controlling circuit
JPS5990418A (en) * 1982-11-15 1984-05-24 Toshiba Corp Agc circuit
JPS61120377A (en) * 1984-11-14 1986-06-07 Matsushita Electric Ind Co Ltd Tape recorder
JPS61239706A (en) * 1985-04-17 1986-10-25 Canon Inc Amplifier circuit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57173213A (en) * 1981-04-16 1982-10-25 Matsushita Electric Ind Co Ltd Muting circuit
JPS57184310A (en) * 1981-05-09 1982-11-13 Nippon Gakki Seizo Kk Automatic gain controlling circuit
JPS5990418A (en) * 1982-11-15 1984-05-24 Toshiba Corp Agc circuit
JPS61120377A (en) * 1984-11-14 1986-06-07 Matsushita Electric Ind Co Ltd Tape recorder
JPS61239706A (en) * 1985-04-17 1986-10-25 Canon Inc Amplifier circuit

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