JPS5547708A - Bias circuit for amplifier - Google Patents

Bias circuit for amplifier

Info

Publication number
JPS5547708A
JPS5547708A JP12189278A JP12189278A JPS5547708A JP S5547708 A JPS5547708 A JP S5547708A JP 12189278 A JP12189278 A JP 12189278A JP 12189278 A JP12189278 A JP 12189278A JP S5547708 A JPS5547708 A JP S5547708A
Authority
JP
Japan
Prior art keywords
base
level
emitter
voltage
transistors
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
JP12189278A
Other languages
Japanese (ja)
Inventor
Ryuichi Fukuda
Yutaka Nanami
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 JP12189278A priority Critical patent/JPS5547708A/en
Publication of JPS5547708A publication Critical patent/JPS5547708A/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
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0261—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the polarisation voltage or current, e.g. gliding Class A

Landscapes

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

Abstract

PURPOSE:To increase the efficiency and to reduce the distortion, by shifting the bias point depending on the input signal level. CONSTITUTION:The terminal 29 is biased at a given level in advance. When the input signal is increased, DC signal is caused to the output of the detector 2. DC signal is fed to the base of the transistor 3. The sum of the forward bias voltage of diodes 21 and 22 is equal to the sum of the voltage between the base and emitter of the transistors 3 and 20, and the emitter current of the transistors 3 and 20 is in proportional to the base level of the transisto 3. The current in proportion to the base level of the transistor 3 flows to the resistors 4 and 5. When the forward bias voltage of the diodes 16 and 17 is made equal to the voltage between base and emitter of the transistors 8 and 9, the emitter current is proportional to the level of the terminal 29, and fixed bias is given at small input and optimum bias is given at greater input.
JP12189278A 1978-10-03 1978-10-03 Bias circuit for amplifier Pending JPS5547708A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12189278A JPS5547708A (en) 1978-10-03 1978-10-03 Bias circuit for amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12189278A JPS5547708A (en) 1978-10-03 1978-10-03 Bias circuit for amplifier

Publications (1)

Publication Number Publication Date
JPS5547708A true JPS5547708A (en) 1980-04-04

Family

ID=14822481

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12189278A Pending JPS5547708A (en) 1978-10-03 1978-10-03 Bias circuit for amplifier

Country Status (1)

Country Link
JP (1) JPS5547708A (en)

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