JPS553217A - Differential amplifier - Google Patents

Differential amplifier

Info

Publication number
JPS553217A
JPS553217A JP7540478A JP7540478A JPS553217A JP S553217 A JPS553217 A JP S553217A JP 7540478 A JP7540478 A JP 7540478A JP 7540478 A JP7540478 A JP 7540478A JP S553217 A JPS553217 A JP S553217A
Authority
JP
Japan
Prior art keywords
terminal
source
constant current
potential
collector
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
JP7540478A
Other languages
Japanese (ja)
Inventor
Ryuichi Fukuda
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.)
Nippon Columbia Co Ltd
Original Assignee
Nippon Columbia 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 Nippon Columbia Co Ltd filed Critical Nippon Columbia Co Ltd
Priority to JP7540478A priority Critical patent/JPS553217A/en
Publication of JPS553217A publication Critical patent/JPS553217A/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

Landscapes

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

Abstract

PURPOSE:To eliminate occurrence of the potential fluctuation at the output terminal even with such reason that the constant current property is not good for the constant current source contained in the differential amplifier. CONSTITUTION:Constant current source 11 is connected to the emitter side of transistor T1 and T2 each possessing input terminal 1 and 2, and the collector side is connected to the power source. At the same time, the collector side of transistor T3 is connected to the output end of source 11, and the base of T3 is connected to connection point 14 of resistance 7 and 8 which are connected in series between output terminal 3 and 4 with the same value. Furthermore, the emitter side of T3 is connected to different constant current source 12 in common to the emitter side of T4. Here if the in-phase input is supplied to both terminal 1 and 2, the potential varies for terminal 3 and 4 to rise up, for example. As a result, the potential of point 14 also rises up, and the collector current of T3 increases with the decreased current component which is given to T1 and T2 from source 11. Thus, the potential can be kept steady for terminal 3 and 4.
JP7540478A 1978-06-23 1978-06-23 Differential amplifier Pending JPS553217A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7540478A JPS553217A (en) 1978-06-23 1978-06-23 Differential amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7540478A JPS553217A (en) 1978-06-23 1978-06-23 Differential amplifier

Publications (1)

Publication Number Publication Date
JPS553217A true JPS553217A (en) 1980-01-11

Family

ID=13575196

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7540478A Pending JPS553217A (en) 1978-06-23 1978-06-23 Differential amplifier

Country Status (1)

Country Link
JP (1) JPS553217A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5939904A (en) * 1998-02-19 1999-08-17 Lucent Technologies, Inc. Method and apparatus for controlling the common-mode output voltage of a differential buffer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS499573A (en) * 1972-05-25 1974-01-28

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS499573A (en) * 1972-05-25 1974-01-28

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5939904A (en) * 1998-02-19 1999-08-17 Lucent Technologies, Inc. Method and apparatus for controlling the common-mode output voltage of a differential buffer
JPH11330947A (en) * 1998-02-19 1999-11-30 Lucent Technol Inc Method and device for controlling common mode output voltage of differential buffer

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