EP0169388B1 - Source de courant constant intégrée - Google Patents

Source de courant constant intégrée Download PDF

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Publication number
EP0169388B1
EP0169388B1 EP85107776A EP85107776A EP0169388B1 EP 0169388 B1 EP0169388 B1 EP 0169388B1 EP 85107776 A EP85107776 A EP 85107776A EP 85107776 A EP85107776 A EP 85107776A EP 0169388 B1 EP0169388 B1 EP 0169388B1
Authority
EP
European Patent Office
Prior art keywords
current
stage
operational amplifier
output
transistor
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
EP85107776A
Other languages
German (de)
English (en)
Other versions
EP0169388A1 (fr
Inventor
Ulrich Lachmann
Erwin Krug
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to AT85107776T priority Critical patent/ATE37619T1/de
Publication of EP0169388A1 publication Critical patent/EP0169388A1/fr
Application granted granted Critical
Publication of EP0169388B1 publication Critical patent/EP0169388B1/fr
Expired legal-status Critical Current

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G05F1/561—Voltage to current converters

Definitions

  • the present invention relates to an integrated constant current source according to the preamble of patent claim 1.
  • FIG. 1 shows a basic circuit diagram of an integrated constant current source of the generic type.
  • a constant current source contains an operational amplifier UP which compares a reference voltage U ref fed in at its inverting input with a voltage dropping across a reference resistor R Ref .
  • a transistor stage T is coupled to the output of the operational amplifier OP, which converts the output voltage of the operational amplifier into a corresponding current.
  • I c1 One labeled I c1 .
  • Collector current of this transistor stage T flows through the reference resistor R ref , across which a voltage drops due to the current I c1 flowing through it. which is fed into the non-inverting input of the operational amplifier OP.
  • the transistor stage T On the basis of the comparison carried out by the operational amplifier OP, the transistor stage T is driven such that the reference voltage U ref and the voltage dropping across the reference resistor R ref are the same.
  • the product of the collector current I c1 of the transistor stage T and the value of the reference resistor R ref is thus equal to the reference voltage U ref . This means that the collector current I c1 is also constant.
  • the emitter of the transistor stage T and the emitter of a transistor stage T 2 which will be explained below, are connected to a supply voltage with further wiring.
  • a constant current based on the supply voltage would be removable.
  • the further transistor stage T 2 is coupled to the output of the operational amplifier OP, in the circuit of whose collector-emitter path there is a current mirror formed by transistors T 3 , T 4 against the reference potential (ground).
  • This current mirror is formed by a lying in the collector-emitter circuit of the transistor stage T2, diode reference transistor T 3 as well as a switch controlled by this transistor T 4, wherein about the last-mentioned transistor T 4 and an output A of the constant current source, a constant output current I a on a consumer, not shown, coupled to the output A flows.
  • the constancy of the currents and in particular of the output current I a applies only to a first approximation. If you take a closer look at the current ratio, for example in the alcohol range, it becomes apparent that the constancy of the output current I a is not precise enough for many applications. A portion of the collector current I c2 supplied by the transistor stage T 2 is lost, which is used as the drive current in the form of base currents I B3 and I B4 for driving the current mirror transistors T 3 . T 4 is required.
  • the base currents mentioned depend on the current amplifications of the current mirror transistors T 3 , T 4 , which can vary widely, this variation being incorporated in the output current I a accordingly.
  • an emitter and / or collector area ratio of 1: n is selected for setting a predetermined output current I a in the current mirror for the transistors T 3 and T 4 , ie the emitter and / or collector area of the transistor T 4 n times larger than the emitter and / or collector area of the transistor T 3 .
  • the output current constancy is also adversely affected by the so-called early effect, which is that in the active part of the characteristic field of a transistor, the collector current is not independent of the collector-emitter voltage, i. H. runs horizontally in the characteristic field, but also increases with increasing collector-emitter voltage.
  • the present invention is therefore based on the object of specifying a circuit for compensating for fluctuations in the output current caused by the base currents in the current mirror in the case of an integrated constant current source of the type explained above, this circuit also being able to be used to compensate for the early effect.
  • FIG. 2 shows a circuit diagram of an integrated constant current source according to FIG. 1 which has been expanded in accordance with the invention, the same elements being provided with the same reference symbols in FIGS. 1 and 2.
  • the circuit arrangement according to FIG. 2 corresponds to the circuit arrangement according to FIG. 1, so that here the corresponding statements regarding the circuit arrangement according to FIG. 1 can be referenced.
  • T 2 contains a further current mirror T 7 , T 8 , in which Collector-emitter circuit of the controlled transistor T 7 of this current mirror is a transistor T 6 , which is coupled with its base to the reference resistor R ref .
  • the current mirror T 7 is obtained via this transistor T 6 , which converts the voltage across the resistor R ef into a corresponding current.
  • T 8 is a current which also includes the error caused by the base currents of the transistors T 7 , T 8 .
  • This fault current is designated I F in FIG. 2. Provided that the transistors T 3 , T 4 of the first current mirror and the transistors T 7 .
  • the second current mirror T 7 , T 8 correspond in their properties, the second current mirror T 7 , T 8 produces the same error caused by the base currents as is caused by the base currents l B3 , l B4 in the first current mirror T 3 , T 4 .
  • the properties of the transistors mentioned essentially match one another. At least, however, it is possible with very good yields to switch off those specimens in which the transistors T 3 , T 4 of the first current mirror or T 7 , T 8 of the second current mirror are not paired sufficiently well by corresponding measurements.
  • the transistor stage T 4 carrying the constant output current l a which still has errors due to the early effects, is coupled via a further operational amplifier OP 1 connected as a voltage follower to the transistor stage T 6 coupled to the reference resistor R ref .
  • This transistor T 6 lies with its collector-emitter path in the circuit of the transistor stage T 7 carrying the mirrored current of the second current mirror T 6 , T 7 and with its base on the reference resistor R rer .
  • a first current mirror T 3 , T 4 is selected to set a predetermined value of the output current I a , in which the reference transistor T 3 connected as a diode and the one controlled by this, the (Mirrored) constant output current I a leading transistor T 4 have an emitter and / or collector area ratio of 1: n, it is provided in a further development of the invention to take this area ratio into account that the coupled to the reference resistor R ref and the further operational amplifier OP 1 Transistor T 6, based on the emitter and / or collector area of the reference transistor T 3 of the first current mirror T 3 , T 4, has an n-fold emitter and / or collector area and the transistor T 8 which acts as a diode and acts as a reference transistor and the mirrored current leading transistor T 7 of the second current mirror T 7 , T a an emitter and / or collector area ratio of 1: (n + 1). The compensating effect is thus retained even for an output current I a determined by the ratio n.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Electrical Variables (AREA)
  • Amplifiers (AREA)
  • Control Of El Displays (AREA)
  • Bipolar Transistors (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Claims (4)

1. Source de courant constant intégrée, comprenant un amplificateur opérationnel (OP), à l'entrée inverseuse (-) duquel peut être appliquée une tension de référence (Ue) et à la sortie duquel est couplé un premier étage (T1) qui transforme sa tension de sortie en un courant (lc1), une résistance de référence (Rref) disposée dans le circuit du premier étage (T1), à partir de laquelle, en vue du couplage de la chute de tension produite sur elle, un couplage est prévu avec l'entrée non inverseuse (+) de l'amplificateur opérationnel (OP), un deuxième étage (T2) couplé à la sortie de l'amplificateur opérationnel (OP) et transformant la tension de celui-ci en un courant (lc2), de même qu'un premier montage de courant dit à miroir ou montage symétrique de courant (T3, T4). prévu dans le circuit du second étage (T2 et fournissant un courant de sortie (la) constant en première approximation, caractérisée par un troisième étage (T5), couplé à la sortie de l'amplificateur opérationnel (OP) et transformant la tension de sortie de celui-ci en un courant (lc5), un second montage symétrique de courant (T7, Ta) prévu dans le circuit du troisième étage (T5), ainsi qu'un étage (T6), couplé à la résistance de référence (Rref), qui est prévu dans le circuit de l'étage (T7) du second montage symétrique de courant (T7, Ta) par lequel passe le courant reflété.
2. Source selon la revendication 1, caractérisée en ce que l'étage (T4) du premier montage symétrique de courant (T3, T4) par lequel passe le courant de sortie (la) constant, est couplé, à travers un amplificateur opérationnel (OP,) supplémentaire, monté en suiveur de tension, à l'étage (T6) couplé à la résistance de référence (Rref).
3. Source selon la revendication 1 ou 2, caractérisée en ce que l'étage (T6) couplé à la résistance de référence (Rref) est formé par un transistor qui est connecté par son trajet collecteur- émetteur dans le circuit de l'étage (T7) du second montage symétrique de courant (T6, T7) par lequel passe le courant reflété, et qui est connecté par sa base à la résistance de référence (Rref).
4. Source selon une des revendications 1 à 3, comprenant un premier montage symétrique de courant (T3, T4), dans lequel un transistor de référence (T3) monté en diode et le transistor (T4) commandé par celui-ci et par lequel passe le courant de sortie (la) constant (reflété), possèdent un rapport d'aires de surface des émetteurs et/ou des collecteurs de 1 : n, caractérisée en ce que le transistor (T6), couplé à la résistance de référence (Rref) et à l'amplificateur opérationnel (OP,) supplémentaire, possède une aire de surface d'émetteur et/ou de collecteur correspondant à n fois l'aire de surface de l'émetteur et/ou du collecteur du transistor de référence (T3) du premier montage symétrique de courant (T3, T4) et que le transistor (Ta), monté en diode et agissant comme transistor de référence, de même que le transistor (T7) parcouru par le courant reflété du second montage symétrique de courant (T7, T8), possèdent un rapport d'aires de surface des émetteurs et/ou des collecteurs de 1 : (n + 1).
EP85107776A 1984-07-16 1985-06-24 Source de courant constant intégrée Expired EP0169388B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85107776T ATE37619T1 (de) 1984-07-16 1985-06-24 Integrierte konstantstromquelle.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3426166 1984-07-16
DE3426166 1984-07-16

Publications (2)

Publication Number Publication Date
EP0169388A1 EP0169388A1 (fr) 1986-01-29
EP0169388B1 true EP0169388B1 (fr) 1988-09-28

Family

ID=6240752

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85107776A Expired EP0169388B1 (fr) 1984-07-16 1985-06-24 Source de courant constant intégrée

Country Status (6)

Country Link
US (1) US4651083A (fr)
EP (1) EP0169388B1 (fr)
JP (1) JPS6136816A (fr)
KR (1) KR860001374A (fr)
AT (1) ATE37619T1 (fr)
DE (1) DE3565328D1 (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4706013A (en) * 1986-11-20 1987-11-10 Industrial Technology Research Institute Matching current source
US5266887A (en) * 1988-05-24 1993-11-30 Dallas Semiconductor Corp. Bidirectional voltage to current converter
US5021730A (en) * 1988-05-24 1991-06-04 Dallas Semiconductor Corporation Voltage to current converter with extended dynamic range
US5525897A (en) * 1988-05-24 1996-06-11 Dallas Semiconductor Corporation Transistor circuit for use in a voltage to current converter circuit
US5004938A (en) * 1989-03-03 1991-04-02 Acer Incorporated MOS analog NOR amplifier and current source therefor
US4920309A (en) * 1989-03-24 1990-04-24 National Semiconductor Corporation Error amplifier for use with parallel operated autonomous current or voltage regulators using transconductance type power amplifiers
IT1252324B (it) * 1991-07-18 1995-06-08 Sgs Thomson Microelectronics Circuito integrato regolatore di tensione ad elevata stabilita' e basso consumo di corrente.
US5153499A (en) * 1991-09-18 1992-10-06 Allied-Signal Inc. Precision voltage controlled current source with variable compliance
JPH0635559A (ja) * 1992-07-17 1994-02-10 Toko Inc 定電流回路
DE4315296C2 (de) * 1993-05-07 2000-03-02 Siemens Ag Stromquellenanordnung zum Erzeugen mehrfacher Referenzströme
DE4326282C2 (de) * 1993-08-05 1995-12-14 Telefunken Microelectron Stromquellenschaltung
US5519310A (en) * 1993-09-23 1996-05-21 At&T Global Information Solutions Company Voltage-to-current converter without series sensing resistor
US5661395A (en) * 1995-09-28 1997-08-26 International Business Machines Corporation Active, low Vsd, field effect transistor current source
JP3593396B2 (ja) * 1995-11-17 2004-11-24 富士通株式会社 電流出力回路
DE10145034B4 (de) 2001-09-13 2005-04-21 Infineon Technologies Ag Anordnung mit einer Stromquelle und einem zu dieser in Reihe geschalteten Schalter
DE102005010311A1 (de) 2005-03-03 2006-09-14 Atmel Germany Gmbh Verfahren und Gießform zur Herstellung eines optischen Halbleitermoduls
DE102005022612A1 (de) * 2005-05-10 2006-11-16 Atmel Germany Gmbh Treiberschaltung für elektronische Bauteile

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2844745A1 (de) * 1978-10-13 1980-04-24 Jurij Konstantinovits Kuschner Schaltung fuer stabilisierte stromquellen
DE3136780A1 (de) * 1981-09-16 1983-03-31 Siemens AG, 1000 Berlin und 8000 München Integrierte halbleiterschaltung

Also Published As

Publication number Publication date
DE3565328D1 (en) 1988-11-03
EP0169388A1 (fr) 1986-01-29
US4651083A (en) 1987-03-17
ATE37619T1 (de) 1988-10-15
JPS6136816A (ja) 1986-02-21
KR860001374A (ko) 1986-02-26

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