JPS55112009A - Bias circuit - Google Patents

Bias circuit

Info

Publication number
JPS55112009A
JPS55112009A JP1836179A JP1836179A JPS55112009A JP S55112009 A JPS55112009 A JP S55112009A JP 1836179 A JP1836179 A JP 1836179A JP 1836179 A JP1836179 A JP 1836179A JP S55112009 A JPS55112009 A JP S55112009A
Authority
JP
Japan
Prior art keywords
transistor
emitter
voltage
resistance
output
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.)
Granted
Application number
JP1836179A
Other languages
Japanese (ja)
Other versions
JPS6211525B2 (en
Inventor
Kunio Seki
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP1836179A priority Critical patent/JPS55112009A/en
Publication of JPS55112009A publication Critical patent/JPS55112009A/en
Publication of JPS6211525B2 publication Critical patent/JPS6211525B2/ja
Granted 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 improve the voltage reducing characteristics for the amplifier circuit by applying the output voltage of the power source ripple elimination filter to the base of the transistor and providing the load resistance between the emitter of the transistor mentioned above and the emitter of the emitter follower transistor. CONSTITUTION:The power source ripple elimination filter is formed with resistance R1 and capacitor C, and the output of this filter is applied to the constant voltage circuit consisting of resistance R2 and diode D. For transistor Q1, the constant voltage of the constant voltage circuit is supplied to the base to obtain the bias output through the emitter. For this bias output, the power source ripple is eliminated through the emitter follower circuit consisting of transistor Q2 and resistance R3. At the same time, the voltage reducing characteristics can be improved. The bias voltage thus formed in supplied to amplifier circuit 2.
JP1836179A 1979-02-21 1979-02-21 Bias circuit Granted JPS55112009A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1836179A JPS55112009A (en) 1979-02-21 1979-02-21 Bias circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1836179A JPS55112009A (en) 1979-02-21 1979-02-21 Bias circuit

Publications (2)

Publication Number Publication Date
JPS55112009A true JPS55112009A (en) 1980-08-29
JPS6211525B2 JPS6211525B2 (en) 1987-03-13

Family

ID=11969546

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1836179A Granted JPS55112009A (en) 1979-02-21 1979-02-21 Bias circuit

Country Status (1)

Country Link
JP (1) JPS55112009A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4939479A (en) * 1989-08-31 1990-07-03 Sgs-Thomson Microelectronics (Pte) Ltd. Audio amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4939479A (en) * 1989-08-31 1990-07-03 Sgs-Thomson Microelectronics (Pte) Ltd. Audio amplifier

Also Published As

Publication number Publication date
JPS6211525B2 (en) 1987-03-13

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