JPS5575314A - Bias circuit - Google Patents

Bias circuit

Info

Publication number
JPS5575314A
JPS5575314A JP14986978A JP14986978A JPS5575314A JP S5575314 A JPS5575314 A JP S5575314A JP 14986978 A JP14986978 A JP 14986978A JP 14986978 A JP14986978 A JP 14986978A JP S5575314 A JPS5575314 A JP S5575314A
Authority
JP
Japan
Prior art keywords
current
source
emitter
flowing
turned
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
JP14986978A
Other languages
Japanese (ja)
Inventor
Yoshiaki Sano
Toshio Hanazawa
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP14986978A priority Critical patent/JPS5575314A/en
Publication of JPS5575314A publication Critical patent/JPS5575314A/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
    • H03F1/30—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 obtain a bias source featuring a high resistance to the power fluctuation by using the forward voltage of the transistor driven by the constant current source for the constant voltage source. CONSTITUTION:The base-emitter saturation current is proportional to the emitter area within the same chip of the monolithic IC. Each emitter area of transistors Q3-Q6 are referred to as SE3-SE6 to secure selection of SE4>SE3 and SE5>SE6 each. At the same time, current I2 flowing through Q4 is set larger than current I3 flowing through Q6 when the power source is on. As a result, transistor Q2 is turned on by the current of I2-I3=I4, and then Q1, Q3 and Q4 are turned on. After starting, I4 is reduced down to such level that can be ignored compared with I2 and I3. As a result, I2 becomes nearly identical to I3, and the constant current level is secured for Q3, Q5 and Q7 of diode connection. Thus the potential is stabilized at point A which is expressed by the sum of the base-emitter voltage of Q3 and Q6.
JP14986978A 1978-12-04 1978-12-04 Bias circuit Pending JPS5575314A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14986978A JPS5575314A (en) 1978-12-04 1978-12-04 Bias circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14986978A JPS5575314A (en) 1978-12-04 1978-12-04 Bias circuit

Publications (1)

Publication Number Publication Date
JPS5575314A true JPS5575314A (en) 1980-06-06

Family

ID=15484421

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14986978A Pending JPS5575314A (en) 1978-12-04 1978-12-04 Bias circuit

Country Status (1)

Country Link
JP (1) JPS5575314A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5248951A (en) * 1975-10-17 1977-04-19 Toshiba Corp Bias circuit
JPS5397354A (en) * 1977-02-07 1978-08-25 Fujitsu Ltd Amplifier circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5248951A (en) * 1975-10-17 1977-04-19 Toshiba Corp Bias circuit
JPS5397354A (en) * 1977-02-07 1978-08-25 Fujitsu Ltd Amplifier circuit

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