JPS5648704A - Direct-current amplifier and direct-current differential amplifier - Google Patents

Direct-current amplifier and direct-current differential amplifier

Info

Publication number
JPS5648704A
JPS5648704A JP12386279A JP12386279A JPS5648704A JP S5648704 A JPS5648704 A JP S5648704A JP 12386279 A JP12386279 A JP 12386279A JP 12386279 A JP12386279 A JP 12386279A JP S5648704 A JPS5648704 A JP S5648704A
Authority
JP
Japan
Prior art keywords
operational amplifier
resistance
output
amplifier
direct
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
JP12386279A
Other languages
Japanese (ja)
Inventor
Tsutomu Okayama
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP12386279A priority Critical patent/JPS5648704A/en
Publication of JPS5648704A publication Critical patent/JPS5648704A/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
    • H03F1/56—Modifications of input or output impedances, not otherwise provided for

Abstract

PURPOSE:To obtain an operational amplifier that has high input resistance without increasing the number of DC amplification stages while facilitating the selection of the resistance for determining an amplification factor with an attenuation factor of noises, by providing an operational amplifier and an inverting amplifier that inverts and amplifies its output. CONSTITUTION:Operational amplifier 10 and inverting amplifier 20 that inverts and amplifies the output of operational amplifier 10 are provided. To the inverted input terminal of operational amplifier 10, the output of operational amplifier 10 is applied after being voltage-divided by resistances 18 and 14 and to the uninverted input terminal, the output of inverting amplifier 20 is applied via capacitor 12 as well as input signal e1 passed through resistance 16, so that output signal E0 will appear at the output terminal of operational amplifier 10. In the above-mentioned constitution, if the input resistance of operational amplifier 10 is not sufficient, resistance values r2 and Rf of resistances 18 and 14 have the resistance ratio from a required amplification factor, so that resistance values of resistances 18 and 14 can freely be selected in themselves. Resistance 16 does not exert any influence on a DC input-output relation at all.
JP12386279A 1979-09-28 1979-09-28 Direct-current amplifier and direct-current differential amplifier Pending JPS5648704A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12386279A JPS5648704A (en) 1979-09-28 1979-09-28 Direct-current amplifier and direct-current differential amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12386279A JPS5648704A (en) 1979-09-28 1979-09-28 Direct-current amplifier and direct-current differential amplifier

Publications (1)

Publication Number Publication Date
JPS5648704A true JPS5648704A (en) 1981-05-02

Family

ID=14871218

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12386279A Pending JPS5648704A (en) 1979-09-28 1979-09-28 Direct-current amplifier and direct-current differential amplifier

Country Status (1)

Country Link
JP (1) JPS5648704A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2651389A1 (en) * 1989-08-25 1991-03-01 Radiotechnique Compelec DIFFERENTIAL AMPLIFIER WITH CAPACITIVE COUPLING.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4047122A (en) * 1976-02-11 1977-09-06 Westinghouse Electric Corporation Frequency compensated differential amplifier

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4047122A (en) * 1976-02-11 1977-09-06 Westinghouse Electric Corporation Frequency compensated differential amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2651389A1 (en) * 1989-08-25 1991-03-01 Radiotechnique Compelec DIFFERENTIAL AMPLIFIER WITH CAPACITIVE COUPLING.

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