JPS57147723A - Constant current circuit - Google Patents

Constant current circuit

Info

Publication number
JPS57147723A
JPS57147723A JP3417681A JP3417681A JPS57147723A JP S57147723 A JPS57147723 A JP S57147723A JP 3417681 A JP3417681 A JP 3417681A JP 3417681 A JP3417681 A JP 3417681A JP S57147723 A JPS57147723 A JP S57147723A
Authority
JP
Japan
Prior art keywords
current
absorbing circuit
circuit
emitter
reproducibility
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
JP3417681A
Other languages
Japanese (ja)
Other versions
JPH023209B2 (en
Inventor
Masanobu Shinoda
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.)
NIHON DENKI AISHII MAIKON SYSTEM KK
NEC IC Microcomputer Systems Co Ltd
Original Assignee
NIHON DENKI AISHII MAIKON SYSTEM KK
NEC IC Microcomputer Systems 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 NIHON DENKI AISHII MAIKON SYSTEM KK, NEC IC Microcomputer Systems Co Ltd filed Critical NIHON DENKI AISHII MAIKON SYSTEM KK
Priority to JP3417681A priority Critical patent/JPS57147723A/en
Publication of JPS57147723A publication Critical patent/JPS57147723A/en
Publication of JPH023209B2 publication Critical patent/JPH023209B2/ja
Granted 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
    • G05F3/26—Current mirrors
    • G05F3/265—Current mirrors using bipolar transistors only

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (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 suppress output variation by increasing the output impedance of a current absorbing circuit by constituting a feedback circuit by using a multi- emitter transistor (TR) between a circuit having a reference current source and the current absorbing circuit as a load. CONSTITUTION:When TRs 5, 6 and 13 have an equal current amplification factor hFE, relation between the current value I01 of a reference current source 3 and the current value I02 of a current absorbing circuit (collector current of multi-emitter TR13) is I01-I02 2IB1/(1+hFE), and an error current from the reference current source is reduced, improving the reproducibility of an input and an output current. Further, since a feedback loop is formed by using the multi-emitter TR13, the output impedance of the current absorbing circuit as the load 4 is increased and even if a maximum potential terminal 1 has variation, the reproducibility of the reference current source 3 is not spoiled. Even when there are many branch paths having loads, the current absorbing circuit has excellent reproducibility.
JP3417681A 1981-03-10 1981-03-10 Constant current circuit Granted JPS57147723A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3417681A JPS57147723A (en) 1981-03-10 1981-03-10 Constant current circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3417681A JPS57147723A (en) 1981-03-10 1981-03-10 Constant current circuit

Publications (2)

Publication Number Publication Date
JPS57147723A true JPS57147723A (en) 1982-09-11
JPH023209B2 JPH023209B2 (en) 1990-01-22

Family

ID=12406888

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3417681A Granted JPS57147723A (en) 1981-03-10 1981-03-10 Constant current circuit

Country Status (1)

Country Link
JP (1) JPS57147723A (en)

Also Published As

Publication number Publication date
JPH023209B2 (en) 1990-01-22

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