JPS57182220A - Constant-current circuit - Google Patents

Constant-current circuit

Info

Publication number
JPS57182220A
JPS57182220A JP6596581A JP6596581A JPS57182220A JP S57182220 A JPS57182220 A JP S57182220A JP 6596581 A JP6596581 A JP 6596581A JP 6596581 A JP6596581 A JP 6596581A JP S57182220 A JPS57182220 A JP S57182220A
Authority
JP
Japan
Prior art keywords
difference
current
current density
constant
resistance
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
JP6596581A
Other languages
Japanese (ja)
Inventor
Yoshihiro Yoshida
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP6596581A priority Critical patent/JPS57182220A/en
Publication of JPS57182220A publication Critical patent/JPS57182220A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • G05F3/08—Regulating voltage or current wherein the variable is dc
    • G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
    • G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
    • G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
    • G05F3/30—Regulators using the difference between the base-emitter voltages of two bipolar transistors operating at different current densities

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Nonlinear Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

PURPOSE:To obtain the titled circuit which can operate under low voltages and can be constructed with integrated circuits, by controlling the electric current in such a way that the potential difference across both ends of a resistance will be equal to the offset voltage of a differentially amplifying circuit which is generated because of the difference in current density. CONSTITUTION:A constant current is obtained by controlling an electric current IREF flowing into a resistance R12 in such a way that a potential difference DELTAVBE across both ends of the resistance R12 will be equal to offset voltages of differentially amplifying circuits Q1-Q4 which are generated because of the difference in current density. In the constant-current circuit, the difference in current density of a differential amplifier composed of transistors Q1 and Q2 is produced by a current mirror circuit composed of transistors Q3 and Q4. Since DELTAVBE due to the difference in current density and R12XIREF operate so as to balance with each other under the same condition, operations under low voltages become possible.
JP6596581A 1981-04-30 1981-04-30 Constant-current circuit Pending JPS57182220A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6596581A JPS57182220A (en) 1981-04-30 1981-04-30 Constant-current circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6596581A JPS57182220A (en) 1981-04-30 1981-04-30 Constant-current circuit

Publications (1)

Publication Number Publication Date
JPS57182220A true JPS57182220A (en) 1982-11-10

Family

ID=13302209

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6596581A Pending JPS57182220A (en) 1981-04-30 1981-04-30 Constant-current circuit

Country Status (1)

Country Link
JP (1) JPS57182220A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62182818A (en) * 1986-02-06 1987-08-11 Victor Co Of Japan Ltd Constant voltage power supply circuit
JPH01226015A (en) * 1988-03-04 1989-09-08 Nec Corp Constant current circuit
JP2007304860A (en) * 2006-05-11 2007-11-22 Nec Electronics Corp Current compensation circuit
JP4674947B2 (en) * 2000-09-29 2011-04-20 オリンパス株式会社 Constant voltage output circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62182818A (en) * 1986-02-06 1987-08-11 Victor Co Of Japan Ltd Constant voltage power supply circuit
JPH01226015A (en) * 1988-03-04 1989-09-08 Nec Corp Constant current circuit
JP4674947B2 (en) * 2000-09-29 2011-04-20 オリンパス株式会社 Constant voltage output circuit
JP2007304860A (en) * 2006-05-11 2007-11-22 Nec Electronics Corp Current compensation circuit

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