JPS55165012A - Amplifier - Google Patents

Amplifier

Info

Publication number
JPS55165012A
JPS55165012A JP7217679A JP7217679A JPS55165012A JP S55165012 A JPS55165012 A JP S55165012A JP 7217679 A JP7217679 A JP 7217679A JP 7217679 A JP7217679 A JP 7217679A JP S55165012 A JPS55165012 A JP S55165012A
Authority
JP
Japan
Prior art keywords
signal
amplifier
circuit
voltage
fed
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
JP7217679A
Other languages
Japanese (ja)
Other versions
JPS6226205B2 (en
Inventor
Michinobu Ohata
Masao Yamazawa
Hirokazu Fukui
Takafumi Nakajo
Masayuki Takahashi
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 JP7217679A priority Critical patent/JPS55165012A/en
Publication of JPS55165012A publication Critical patent/JPS55165012A/en
Publication of JPS6226205B2 publication Critical patent/JPS6226205B2/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
    • H03G3/34—Muting amplifier when no signal is present
    • H03G3/348—Muting in response to a mechanical action or to power supply variations, e.g. during tuning; Click removal circuits

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To prevent the production of transient oscillation in the amplifier and that of interferring voltage to external circuits by clamping the output voltage of amplifier to a given voltage during the period immediately after and before the power down. CONSTITUTION:The reception signal Vin is input to the terminal 11 and fed to the amplifier 12, and no signal Vin is for a certain period. This no-input period is detected at the monitor circuit and the power down command signal PD is fed to the terminal 24. The control circuit 23 of the interface 21 receives the signal PD, the switch switching control signal PS is fed to the switch 22 for closing, and the output of the amplifier 12 is clamped to a given voltage (ground). Next, the circuit 23 delivers the power down command signal PD to the terminal 13 with somewhat delay. When the signal PD is released, the circuit 23 first releases the signal PD, and the switch 22 is OFF with a slight delay than it. Accordingly, the output of the amplifier 12 at the transient period of application of the signal PD and release is clamped at the ground voltage and the interference to the external circuit C is prevented.
JP7217679A 1979-06-11 1979-06-11 Amplifier Granted JPS55165012A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7217679A JPS55165012A (en) 1979-06-11 1979-06-11 Amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7217679A JPS55165012A (en) 1979-06-11 1979-06-11 Amplifier

Publications (2)

Publication Number Publication Date
JPS55165012A true JPS55165012A (en) 1980-12-23
JPS6226205B2 JPS6226205B2 (en) 1987-06-08

Family

ID=13481647

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7217679A Granted JPS55165012A (en) 1979-06-11 1979-06-11 Amplifier

Country Status (1)

Country Link
JP (1) JPS55165012A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59229921A (en) * 1983-05-23 1984-12-24 Rohm Co Ltd Switch circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5490954A (en) * 1977-12-28 1979-07-19 Matsushita Electric Ind Co Ltd Amplifier

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5490954A (en) * 1977-12-28 1979-07-19 Matsushita Electric Ind Co Ltd Amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59229921A (en) * 1983-05-23 1984-12-24 Rohm Co Ltd Switch circuit

Also Published As

Publication number Publication date
JPS6226205B2 (en) 1987-06-08

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