JPS54120563A - High-frequency feedback ampllfier - Google Patents

High-frequency feedback ampllfier

Info

Publication number
JPS54120563A
JPS54120563A JP2668578A JP2668578A JPS54120563A JP S54120563 A JPS54120563 A JP S54120563A JP 2668578 A JP2668578 A JP 2668578A JP 2668578 A JP2668578 A JP 2668578A JP S54120563 A JPS54120563 A JP S54120563A
Authority
JP
Japan
Prior art keywords
emitter
transformer
impedance
improve
input
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
JP2668578A
Other languages
Japanese (ja)
Inventor
Hidetoshi Oota
Nobuyuki Tokura
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 Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP2668578A priority Critical patent/JPS54120563A/en
Publication of JPS54120563A publication Critical patent/JPS54120563A/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
    • H03F1/347—Negative-feedback-circuit arrangements with or without positive feedback using transformers

Landscapes

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

Abstract

PURPOSE:To improve the power gain of a corresponding transistor and also to improve characteristics of a noise index, an overload, etc., by inserting a transformer between an emitter to which a current is fed back and a feedback circuit. CONSTITUTION:Impedance transformer 5 and high-frequency bypass circuit 6 are both added. An input-1 signal is applied to transistor (Tr)3 at the 1st stage by way of input hybrid transformer T1 and, after a difference component with a feedback signal supplied from the feedback circuit 4 side, then transferred to common-collector Tr at the middle stage. To improve the power gain of Tr3 at this time, it is the most effective to make smaller the grounded-emitter current feed back with the emitter-earth impedance made small and for the purpose, transformer 5 is inserted to decrease extremely the emitter-earth impedance including circuit 4, thereby attaining the purpose. As the impedance becomes smaller, the dispersion of the input signal lessens there, so that the deterioration of the noise index can be suppressed to an extremely-small value.
JP2668578A 1978-03-10 1978-03-10 High-frequency feedback ampllfier Pending JPS54120563A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2668578A JPS54120563A (en) 1978-03-10 1978-03-10 High-frequency feedback ampllfier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2668578A JPS54120563A (en) 1978-03-10 1978-03-10 High-frequency feedback ampllfier

Publications (1)

Publication Number Publication Date
JPS54120563A true JPS54120563A (en) 1979-09-19

Family

ID=12200239

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2668578A Pending JPS54120563A (en) 1978-03-10 1978-03-10 High-frequency feedback ampllfier

Country Status (1)

Country Link
JP (1) JPS54120563A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10107554A (en) * 1996-09-20 1998-04-24 Nokia Mobile Phones Ltd Amplifier system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4860562A (en) * 1971-11-26 1973-08-24

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4860562A (en) * 1971-11-26 1973-08-24

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10107554A (en) * 1996-09-20 1998-04-24 Nokia Mobile Phones Ltd Amplifier system

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