JPS55163905A - Feedback amplifier - Google Patents

Feedback amplifier

Info

Publication number
JPS55163905A
JPS55163905A JP7141479A JP7141479A JPS55163905A JP S55163905 A JPS55163905 A JP S55163905A JP 7141479 A JP7141479 A JP 7141479A JP 7141479 A JP7141479 A JP 7141479A JP S55163905 A JPS55163905 A JP S55163905A
Authority
JP
Japan
Prior art keywords
transistor
emitter area
capacitor
emitter
feedback
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
JP7141479A
Other languages
Japanese (ja)
Other versions
JPS637044B2 (en
Inventor
Koichi Tanaka
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 JP7141479A priority Critical patent/JPS55163905A/en
Publication of JPS55163905A publication Critical patent/JPS55163905A/en
Publication of JPS637044B2 publication Critical patent/JPS637044B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/305—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in case of switching on or off of a power supply

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To prevent the generation of a transient noise by providing a DC stopping capacitor with charging or discharging transistors differing in emitter area and by making them respond to transient voltage changes in voltage application to a feedback amplifier or its break. CONSTITUTION:In electric power feed, DC stopping input capacitor C1 and feedback capacitor C2 are both charged momentarily by transistor Q4 and transistor Q5 via input terminal 1 and feedback terminal 2 respectively and emitter area S5 of transistor Q5 is set double than emitter area S4 of transistor Q4. A difference in emitter-base forward voltage between both the transistors due to a difference in emitter area is about 18mV at the normal temperature being in proportion to the logarithm of the area ratio. The time until the stationary state is set is therefore momentary and potentials V1 and V2 at terminals 1 and 2 bear relation V2>V1, so that no pop sound will be made. Consequently, a transient noise can easily be prevented from appearing.
JP7141479A 1979-06-07 1979-06-07 Feedback amplifier Granted JPS55163905A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7141479A JPS55163905A (en) 1979-06-07 1979-06-07 Feedback amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7141479A JPS55163905A (en) 1979-06-07 1979-06-07 Feedback amplifier

Publications (2)

Publication Number Publication Date
JPS55163905A true JPS55163905A (en) 1980-12-20
JPS637044B2 JPS637044B2 (en) 1988-02-15

Family

ID=13459825

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7141479A Granted JPS55163905A (en) 1979-06-07 1979-06-07 Feedback amplifier

Country Status (1)

Country Link
JP (1) JPS55163905A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5859212U (en) * 1981-10-15 1983-04-21 株式会社ケンウッド differential amplifier
JPS58141608U (en) * 1982-03-18 1983-09-24 三洋電機株式会社 differential amplifier circuit
JPS58215105A (en) * 1982-06-07 1983-12-14 Matsushita Electric Ind Co Ltd Amplifying circuit
JPS5980006A (en) * 1982-10-29 1984-05-09 Sanyo Electric Co Ltd Amplifying circuit
JPS6075104A (en) * 1983-10-01 1985-04-27 Rohm Co Ltd Amplifier circuit
JPS60206306A (en) * 1984-03-30 1985-10-17 Rohm Co Ltd Pop tone preventing circuit
JPS61114607A (en) * 1984-11-09 1986-06-02 Rohm Co Ltd Speed-up circuit of amplifier

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS498153A (en) * 1972-05-10 1974-01-24
JPS50122847A (en) * 1974-03-08 1975-09-26

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS498153A (en) * 1972-05-10 1974-01-24
JPS50122847A (en) * 1974-03-08 1975-09-26

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5859212U (en) * 1981-10-15 1983-04-21 株式会社ケンウッド differential amplifier
JPS58141608U (en) * 1982-03-18 1983-09-24 三洋電機株式会社 differential amplifier circuit
JPS58215105A (en) * 1982-06-07 1983-12-14 Matsushita Electric Ind Co Ltd Amplifying circuit
JPS5980006A (en) * 1982-10-29 1984-05-09 Sanyo Electric Co Ltd Amplifying circuit
JPS6075104A (en) * 1983-10-01 1985-04-27 Rohm Co Ltd Amplifier circuit
JPS60206306A (en) * 1984-03-30 1985-10-17 Rohm Co Ltd Pop tone preventing circuit
JPH0463564B2 (en) * 1984-03-30 1992-10-12 Rohm Kk
JPS61114607A (en) * 1984-11-09 1986-06-02 Rohm Co Ltd Speed-up circuit of amplifier
JPH0474881B2 (en) * 1984-11-09 1992-11-27

Also Published As

Publication number Publication date
JPS637044B2 (en) 1988-02-15

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