JPS54122071A - Feedback amplifier - Google Patents

Feedback amplifier

Info

Publication number
JPS54122071A
JPS54122071A JP2932378A JP2932378A JPS54122071A JP S54122071 A JPS54122071 A JP S54122071A JP 2932378 A JP2932378 A JP 2932378A JP 2932378 A JP2932378 A JP 2932378A JP S54122071 A JPS54122071 A JP S54122071A
Authority
JP
Japan
Prior art keywords
circuit
terminal
resistance
capacitor
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.)
Pending
Application number
JP2932378A
Other languages
Japanese (ja)
Inventor
Tsutomu Sugawara
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP2932378A priority Critical patent/JPS54122071A/en
Publication of JPS54122071A publication Critical patent/JPS54122071A/en
Pending 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
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback

Landscapes

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

Abstract

PURPOSE:To obtain a feedback amplifier which makes it possible to ignore the non- linearity of its component capacitor and the influences of an internal series resistance and a high-frequency loss and then improve characteristics. CONSTITUTION:An input signal is supplied to non-inversion input terminal 32 of differential amplifier 31, one terminal of capacitor 34 is connected to inversion input terminal 33, and feedback circuit 36 of a two-terminal impedance network is connected between the other terminal of capacitor 34 and output terminal 35 of differential amplifier circuit 31. Here, the two-terminal impedance network is made adequate for the frequency equivalent of RIAA or NAB. Resistance 37 is connected to the other terminal of capacitor 34 and the earth, and resistance 37 and capacitor 34 constitute another feedback circuit. Between terminals 33 and 35 of circuit 31, DC feedback resistance 38 is connected. The value of resistance 38 is set much larger than the maximum value of the impedance value at the audio frequency of circuit 36. Therefore, the input impedance of circuit 31 is high and the value of resistance 38 is much larger than that of circuit 36; and almost all output current of circuit 31, therefore, flows to the earth via circuit 36 and resistance 37, so that a current flowing to capacitor 34 can be suppressed low.
JP2932378A 1978-03-16 1978-03-16 Feedback amplifier Pending JPS54122071A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2932378A JPS54122071A (en) 1978-03-16 1978-03-16 Feedback amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2932378A JPS54122071A (en) 1978-03-16 1978-03-16 Feedback amplifier

Publications (1)

Publication Number Publication Date
JPS54122071A true JPS54122071A (en) 1979-09-21

Family

ID=12273010

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2932378A Pending JPS54122071A (en) 1978-03-16 1978-03-16 Feedback amplifier

Country Status (1)

Country Link
JP (1) JPS54122071A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3903497A1 (en) * 1989-02-06 1990-08-09 Siemens Ag Low-noise amplifier circuit
DE3941351A1 (en) * 1989-02-06 1991-06-20 Siemens Ag Low noise wide band amplifier for video-audio appts. - uses feedback circuits connected to reference potentials to achieve frequency compensation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3903497A1 (en) * 1989-02-06 1990-08-09 Siemens Ag Low-noise amplifier circuit
DE3941351A1 (en) * 1989-02-06 1991-06-20 Siemens Ag Low noise wide band amplifier for video-audio appts. - uses feedback circuits connected to reference potentials to achieve frequency compensation

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