JPS57147306A - Direct current amplifying circuit - Google Patents

Direct current amplifying circuit

Info

Publication number
JPS57147306A
JPS57147306A JP56031215A JP3121581A JPS57147306A JP S57147306 A JPS57147306 A JP S57147306A JP 56031215 A JP56031215 A JP 56031215A JP 3121581 A JP3121581 A JP 3121581A JP S57147306 A JPS57147306 A JP S57147306A
Authority
JP
Japan
Prior art keywords
emitter
output
amplifying circuit
input
equal
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
JP56031215A
Other languages
Japanese (ja)
Inventor
Hiromi Asanuma
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 JP56031215A priority Critical patent/JPS57147306A/en
Publication of JPS57147306A publication Critical patent/JPS57147306A/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
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/302—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in bipolar transistor amplifiers

Landscapes

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

Abstract

PURPOSE:To minimize the influence of an offset voltage by equalizing a DC input voltage to and a DC output voltage from a DC amplifying circuit to each other. CONSTITUTION:The emitter resistances RE and RE' of transistors (TR) 1 and 2 constituting a differential amplifier have nearly equal values. Currents flowing through the TRs 1 and 2 become nearly equal. The major part of those currents is absorbed by current sources 5 and 6. An output is led out of a TR3 constituting an emitter follower. Negative feedback from the base of the TR3 to the emitter of the TR2 through a resistance RF is provided. The current source 6 absorbs the current flowing through the TR2, so no current flows through the resistance RF. Consequently, the emitter potential of the TR2 and the base potential of the TR3 become equal. When the VBE of both the TRs are considered, the input and output potentials are equal. Then, an offset voltage included in an input side is transferred to an output side as it is.
JP56031215A 1981-03-06 1981-03-06 Direct current amplifying circuit Pending JPS57147306A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56031215A JPS57147306A (en) 1981-03-06 1981-03-06 Direct current amplifying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56031215A JPS57147306A (en) 1981-03-06 1981-03-06 Direct current amplifying circuit

Publications (1)

Publication Number Publication Date
JPS57147306A true JPS57147306A (en) 1982-09-11

Family

ID=12325204

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56031215A Pending JPS57147306A (en) 1981-03-06 1981-03-06 Direct current amplifying circuit

Country Status (1)

Country Link
JP (1) JPS57147306A (en)

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