GB1517246A - Temperature-compensated constant current circuit - Google Patents

Temperature-compensated constant current circuit

Info

Publication number
GB1517246A
GB1517246A GB3954076A GB3954076A GB1517246A GB 1517246 A GB1517246 A GB 1517246A GB 3954076 A GB3954076 A GB 3954076A GB 3954076 A GB3954076 A GB 3954076A GB 1517246 A GB1517246 A GB 1517246A
Authority
GB
United Kingdom
Prior art keywords
current
equal
base
coupling means
compensation
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
GB3954076A
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.)
STMicroelectronics SRL
Original Assignee
ATES Componenti Elettronici SpA
SGS ATES Componenti Elettronici SpA
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 ATES Componenti Elettronici SpA, SGS ATES Componenti Elettronici SpA filed Critical ATES Componenti Elettronici SpA
Publication of GB1517246A publication Critical patent/GB1517246A/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
    • G05F3/26—Current mirrors
    • G05F3/262—Current mirrors using field-effect transistors only
    • 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
    • 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
    • G05F3/267—Current mirrors using both bipolar and field-effect technology

Landscapes

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

Abstract

1517246 Transistor circuits SGS-ATES COMPONENTI ELETTRONICI SpA 23 Sept 1976 [23 Sept 1975] 39540/76 Heading H3T A temperature compensated constant current circuit of the current mirror type, comprises similar transistors T 1 , T 2 , a resistor R 1 , a load R L , coupling means, e.g. the base-emitter path of a transistor T 3 , connected substantially as shown, and a compensation circuit connected in parallel with the transistor T 1 , which produces a compensation current given by (V 1 + V 2 )/R 1 , where V, and V 2 are the respective voltages across the coupling means, and between the control electrode of T, and its emitter, or equivalent, electrode, whereby the collector current of T 2 is rendered independent of temperature. In the embodiment of Fig. 3 the voltages V, and V 2 are each equal to V be , assuming similar transistors, and hence the compensation current supplied through f is 2V be /R 1 and the current through R 1 is (V cc -2V be )/R 1 . The collector current of T 1 , neglecting the base current of T 3 , is thus V cc /R 1 , and hence independent of temperature, and this is substantially equal to the collector current of T 2 . The compensation circuit includes a V be -multiplier network R 3 , R 4 , T 4 , R 4 being equal to R 1 and R 3 being equal to 3R 1 , so that the voltage across the network is substantially equal to 4 V be . The P.D. across resistor R 2 is therefore equal to 2 V be , and if R 2 =R 1 the required compensation current is produced. The purpose of T 3 in this embodiment is to reduce in known manner the base current component flowing through R 1 . In another embodiment, Fig. 2 (not shown), the T 1 collector-base coupling means is a direct connection, and the V be -multiplier is replaced by two diodes (D 1 , D 2 ) in series. In another embodiment, Fig. 4 (not shown), T 3 is replaced by an F.E.T. (T 5 ) and the V be -multiplier is substituted by a network including two F.E.T.s (T 6 , T 7 ) and two diodes (D 1 , D 2 ). In another embodiment, Fig. 5 (not shown), the transistors T 1 , T 2 are F.E.T.'s, the coupling means is a direct connection, and the compensation circuit includes two F.E.T.'s (T 6 , T 7 ) similar to T 1 and T 2 so that their gate-source voltages cancel in like manner to the base-emitter voltages of the bipolar transistors.
GB3954076A 1975-09-23 1976-09-23 Temperature-compensated constant current circuit Expired GB1517246A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2751675A IT1042763B (en) 1975-09-23 1975-09-23 TEMPERATURE COMPENSATED CURRENT MIRROR CIRCUIT

Publications (1)

Publication Number Publication Date
GB1517246A true GB1517246A (en) 1978-07-12

Family

ID=11221809

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3954076A Expired GB1517246A (en) 1975-09-23 1976-09-23 Temperature-compensated constant current circuit

Country Status (4)

Country Link
DE (1) DE2642874C3 (en)
FR (1) FR2325979A1 (en)
GB (1) GB1517246A (en)
IT (1) IT1042763B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2142794A (en) * 1983-05-30 1985-01-23 Sony Corp Voltage to current converting circuit
CN113253791A (en) * 2020-01-28 2021-08-13 美国亚德诺半导体公司 Current mirror arrangement with reduced input impedance

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3603799A1 (en) * 1986-02-07 1987-08-13 Philips Patentverwaltung CURRENT MIRROR SWITCHING
FR2667703A1 (en) * 1990-10-05 1992-04-10 Philips Composants SOURCE OF CURRENT WITH REPORT BETWEEN CURRENT OUTPUT AND INPUT.
US6906580B2 (en) * 2003-06-19 2005-06-14 Semiconductor Components Industries, Llc Method of forming a reference voltage generator and structure therefor
CN116414170B (en) * 2023-03-03 2023-10-10 西安航天民芯科技有限公司 Zero temperature coefficient current generation circuit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU576979A3 (en) * 1971-02-05 1977-10-15 Атес Компоненти Электроничи С.П.А. (Фирма) Low frequency amplifier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2142794A (en) * 1983-05-30 1985-01-23 Sony Corp Voltage to current converting circuit
CN113253791A (en) * 2020-01-28 2021-08-13 美国亚德诺半导体公司 Current mirror arrangement with reduced input impedance

Also Published As

Publication number Publication date
FR2325979B1 (en) 1979-09-28
DE2642874C3 (en) 1981-09-10
DE2642874A1 (en) 1977-03-24
IT1042763B (en) 1980-01-30
DE2642874B2 (en) 1979-09-27
FR2325979A1 (en) 1977-04-22

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19960922