JPS55134513A - Input bias adjusting circuit of amplifier - Google Patents

Input bias adjusting circuit of amplifier

Info

Publication number
JPS55134513A
JPS55134513A JP4136879A JP4136879A JPS55134513A JP S55134513 A JPS55134513 A JP S55134513A JP 4136879 A JP4136879 A JP 4136879A JP 4136879 A JP4136879 A JP 4136879A JP S55134513 A JPS55134513 A JP S55134513A
Authority
JP
Japan
Prior art keywords
current
base
circuit
trs
miller
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
JP4136879A
Other languages
Japanese (ja)
Inventor
Akira Nishioka
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.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP4136879A priority Critical patent/JPS55134513A/en
Publication of JPS55134513A publication Critical patent/JPS55134513A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection

Landscapes

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

Abstract

PURPOSE:To make it possible to cancel automatically an offset voltage by forming the constant-current source of an input differential circuit by using a current Miller circuit and by making use of its base bias current. CONSTITUTION:The constant current source of an input differential amplifying circuit is formed of current Miller circuit 1 and the collector output of either of a couple of common-base transistor TRs Q4 and Q5, e.g., TRQ4 is constant current IO. Base bias currents of TRs Q4 and Q5 are supplied to 4:1 current Miller circuit 2, and the collector output of TRQ12 is the base current supply of differential TRQ1. As a result, since the base currents of TRs Q4 and Q5 are four times those of TRs Q1 and Q2, the Miller output of Miller circuit 2 is equal to the base current of TRQ1, so that any DC current will not flow through input resistance R1. An offset voltage can therefore be canceled.
JP4136879A 1979-04-05 1979-04-05 Input bias adjusting circuit of amplifier Pending JPS55134513A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4136879A JPS55134513A (en) 1979-04-05 1979-04-05 Input bias adjusting circuit of amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4136879A JPS55134513A (en) 1979-04-05 1979-04-05 Input bias adjusting circuit of amplifier

Publications (1)

Publication Number Publication Date
JPS55134513A true JPS55134513A (en) 1980-10-20

Family

ID=12606495

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4136879A Pending JPS55134513A (en) 1979-04-05 1979-04-05 Input bias adjusting circuit of amplifier

Country Status (1)

Country Link
JP (1) JPS55134513A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62225018A (en) * 1986-03-27 1987-10-03 Toshiba Corp Base current correction circuit for transistor amplifier
US4755770A (en) * 1986-08-13 1988-07-05 Harris Corporation Low noise current spectral density input bias current cancellation scheme
JPS63173912U (en) * 1987-04-30 1988-11-11

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62225018A (en) * 1986-03-27 1987-10-03 Toshiba Corp Base current correction circuit for transistor amplifier
US4755770A (en) * 1986-08-13 1988-07-05 Harris Corporation Low noise current spectral density input bias current cancellation scheme
JPS63173912U (en) * 1987-04-30 1988-11-11

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