GB1396669A - Constant current regulating circuit - Google Patents

Constant current regulating circuit

Info

Publication number
GB1396669A
GB1396669A GB4343873A GB4343873A GB1396669A GB 1396669 A GB1396669 A GB 1396669A GB 4343873 A GB4343873 A GB 4343873A GB 4343873 A GB4343873 A GB 4343873A GB 1396669 A GB1396669 A GB 1396669A
Authority
GB
United Kingdom
Prior art keywords
current
transistor
voltage
supplied
point
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.)
Expired
Application number
GB4343873A
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.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
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 Motorola Inc filed Critical Motorola Inc
Publication of GB1396669A publication Critical patent/GB1396669A/en
Expired 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
    • G05F3/222—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 with compensation for device parameters, e.g. Early effect, gain, manufacturing process, or external variations, e.g. temperature, loading, supply voltage
    • G05F3/227—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 with compensation for device parameters, e.g. Early effect, gain, manufacturing process, or external variations, e.g. temperature, loading, supply voltage producing a current or voltage as a predetermined function of the supply voltage

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)
  • Continuous-Control Power Sources That Use Transistors (AREA)
  • Amplifiers (AREA)

Abstract

1396669 Automatic current regulation MOTOROLA Inc 17 Sept 1973 [3 Oct 1972] 43438/73 Heading G3X A current source is connected in series with a P.V. junction device and a semiconductor device having unity gain so that a constant voltage is produced by means of a feedback path at the junction of the two devices. This voltage controls an output device which produces a regulated current. As shown, a supply terminal 16 is connected to a current source in the form of a field effect transistor 14 which may be replaced by a resistor. Current is thus supplied to a diode 26 whose dynamic admittance is equal to the transconductance of a transistor 34, so that the gain of the transistor is unity and the voltage at point 64 is held constant by the action of feedback transistor 36, regardless of changes in the current supplied by the FET 14. The constant voltage is used to control an output transistor 54 so that a regulated current is supplied to a load 20 which may be operational amplifier circuitry. The current regulator may be constructed as an integrated circuit. Variations in the voltage at point 64 caused by temperature changes are compensated by similar variations in the baseemitter voltage of transistor 54.
GB4343873A 1972-10-03 1973-09-17 Constant current regulating circuit Expired GB1396669A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US29472372A 1972-10-03 1972-10-03

Publications (1)

Publication Number Publication Date
GB1396669A true GB1396669A (en) 1975-06-04

Family

ID=23134653

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4343873A Expired GB1396669A (en) 1972-10-03 1973-09-17 Constant current regulating circuit

Country Status (5)

Country Link
US (1) US3777251A (en)
JP (1) JPS5414750B2 (en)
DE (1) DE2349462C3 (en)
FR (1) FR2201578B1 (en)
GB (1) GB1396669A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5436287B2 (en) * 1972-06-06 1979-11-08
DE2330233C3 (en) * 1973-06-14 1975-12-11 Robert 7995 Neukirch Buck Electronic, preferably contact-free, SchaH device
US3886435A (en) * 1973-08-03 1975-05-27 Rca Corp V' be 'voltage voltage source temperature compensation network
US4009432A (en) * 1975-09-04 1977-02-22 Rca Corporation Constant current supply
JPS52161321U (en) * 1976-05-31 1977-12-07
US4177417A (en) * 1978-03-02 1979-12-04 Motorola, Inc. Reference circuit for providing a plurality of regulated currents having desired temperature characteristics
US4500831A (en) * 1982-12-27 1985-02-19 Motorola, Inc. Current source
DE10205194A1 (en) * 2002-02-08 2003-08-28 Tyco Electronics Amp Gmbh Circuit arrangement for controlling a constant current through a load

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB990309A (en) * 1963-05-01 1965-04-28 Atomic Energy Authority Uk Improvements in or relating to electric circuits for matching high impedance signal sources to low impedance loads
US3303413A (en) * 1963-08-15 1967-02-07 Motorola Inc Current regulator
US3383612A (en) * 1965-11-29 1968-05-14 Rca Corp Integrated circuit biasing arrangements
US3430155A (en) * 1965-11-29 1969-02-25 Rca Corp Integrated circuit biasing arrangement for supplying vbe bias voltages
US3532981A (en) * 1968-01-15 1970-10-06 Ford Motor Co Constant current instrument regulator
US3588672A (en) * 1968-02-08 1971-06-28 Tektronix Inc Current regulator controlled by voltage across semiconductor junction device
FR1600781A (en) * 1968-03-15 1970-07-27
DE1300149B (en) * 1968-05-02 1969-07-31 Itt Ind Gmbh Deutsche Integrated solid state semiconductor circuit for a transistor switching amplifier, especially for use in self-controlling clock drives
US3648153A (en) * 1970-11-04 1972-03-07 Rca Corp Reference voltage source
US3629692A (en) * 1971-01-11 1971-12-21 Rca Corp Current source with positive feedback current repeater

Also Published As

Publication number Publication date
FR2201578A1 (en) 1974-04-26
DE2349462C3 (en) 1981-06-11
JPS4972646A (en) 1974-07-13
JPS5414750B2 (en) 1979-06-09
DE2349462A1 (en) 1974-04-11
FR2201578B1 (en) 1977-05-27
DE2349462B2 (en) 1977-03-03
US3777251A (en) 1973-12-04

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years

Effective date: 19930916