JPS56143027A - Constant current circuit - Google Patents

Constant current circuit

Info

Publication number
JPS56143027A
JPS56143027A JP4719680A JP4719680A JPS56143027A JP S56143027 A JPS56143027 A JP S56143027A JP 4719680 A JP4719680 A JP 4719680A JP 4719680 A JP4719680 A JP 4719680A JP S56143027 A JPS56143027 A JP S56143027A
Authority
JP
Japan
Prior art keywords
transistor
current
collector
base
constant
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
JP4719680A
Other languages
Japanese (ja)
Inventor
Tadahiro Wada
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 JP4719680A priority Critical patent/JPS56143027A/en
Publication of JPS56143027A publication Critical patent/JPS56143027A/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
    • G05F3/22—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations wherein the transistors are of the bipolar type only

Abstract

PURPOSE:To give excellent characteristics even with the assembly of lateral PNP, by the control of the symthesized base current of the constant current circuit consisting of PNP transistors so that the collector current of the 1st stage transistor is constant. CONSTITUTION:The collector voltage E1 of the 1st stage transistor 13 is input to the base of the transistor 12 of differential amplifier, the base of the transistor 13 is given to the collector of the transistor 11, and the base current of the transistor 13 is controlled so that the collector voltage E1 can be in coincidence with the reference voltage E0. Thus, the collector current of the transistor 13 is almost adjusted to a constant value, thereby adjusting the collector current of the transistor 14 to a given value and supplying excellent constant current to the load.
JP4719680A 1980-04-10 1980-04-10 Constant current circuit Pending JPS56143027A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4719680A JPS56143027A (en) 1980-04-10 1980-04-10 Constant current circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4719680A JPS56143027A (en) 1980-04-10 1980-04-10 Constant current circuit

Publications (1)

Publication Number Publication Date
JPS56143027A true JPS56143027A (en) 1981-11-07

Family

ID=12768364

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4719680A Pending JPS56143027A (en) 1980-04-10 1980-04-10 Constant current circuit

Country Status (1)

Country Link
JP (1) JPS56143027A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58115906A (en) * 1981-12-28 1983-07-09 レイセオン　カンパニ− Current source circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58115906A (en) * 1981-12-28 1983-07-09 レイセオン　カンパニ− Current source circuit
JPH0681013U (en) * 1981-12-28 1994-11-15 レイセオン・カンパニー Current source circuit

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