JPS57182218A - Constant-current circuit - Google Patents

Constant-current circuit

Info

Publication number
JPS57182218A
JPS57182218A JP6596281A JP6596281A JPS57182218A JP S57182218 A JPS57182218 A JP S57182218A JP 6596281 A JP6596281 A JP 6596281A JP 6596281 A JP6596281 A JP 6596281A JP S57182218 A JPS57182218 A JP S57182218A
Authority
JP
Japan
Prior art keywords
current
constant
current density
resistance
difference
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
JP6596281A
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 JP6596281A priority Critical patent/JPS57182218A/en
Publication of JPS57182218A publication Critical patent/JPS57182218A/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

Abstract

PURPOSE:To obtain a titled circuit which can operate under low voltages and is suitable for converting it to integrated circuits, by controlling an electric current in such a way that the potential difference across a resistance is equal to the offset voltage of a differentially amplifying circuit which is generated because the current density is different. CONSTITUTION:A constant-current is obtained at a transistor Q8 which is a constant-current source by controlling an electric current IREF flowing into a resistance R12 in such a way that a potential difference DELTAVBE across a resistance R12 is equal to offset voltages of differentially amplifying circuits Q1-Q4 which are generated because the current density is different. In this constant- current circuit, the difference in current density is produced by changing the emitter area of the transistors Q1 and Q2. Since the DELTAVBE due to the difference in current density and the R12XIREF operate so as to balance with each other under the same condition, operations under low voltages become possible.
JP6596281A 1981-04-30 1981-04-30 Constant-current circuit Pending JPS57182218A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6596281A JPS57182218A (en) 1981-04-30 1981-04-30 Constant-current circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6596281A JPS57182218A (en) 1981-04-30 1981-04-30 Constant-current circuit

Publications (1)

Publication Number Publication Date
JPS57182218A true JPS57182218A (en) 1982-11-10

Family

ID=13302115

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6596281A Pending JPS57182218A (en) 1981-04-30 1981-04-30 Constant-current circuit

Country Status (1)

Country Link
JP (1) JPS57182218A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58145122A (en) * 1982-02-23 1983-08-29 Jeol Ltd Electron beam exposure device
JPH0510325U (en) * 1991-07-19 1993-02-09 アンリツ株式会社 Conveyor tension device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58145122A (en) * 1982-02-23 1983-08-29 Jeol Ltd Electron beam exposure device
JPH0510325U (en) * 1991-07-19 1993-02-09 アンリツ株式会社 Conveyor tension device

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