EP0479377A1 - Stromquelle mit bestimmtem Verhältnis zwischen Eingangs- und Ausgangsströmen - Google Patents

Stromquelle mit bestimmtem Verhältnis zwischen Eingangs- und Ausgangsströmen Download PDF

Info

Publication number
EP0479377A1
EP0479377A1 EP91202505A EP91202505A EP0479377A1 EP 0479377 A1 EP0479377 A1 EP 0479377A1 EP 91202505 A EP91202505 A EP 91202505A EP 91202505 A EP91202505 A EP 91202505A EP 0479377 A1 EP0479377 A1 EP 0479377A1
Authority
EP
European Patent Office
Prior art keywords
current
transistor
input
series
resistor
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
EP91202505A
Other languages
English (en)
French (fr)
Other versions
EP0479377B1 (de
Inventor
Jean-Claude Perraud
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.)
Photonis SAS
Koninklijke Philips NV
Original Assignee
Photonis SAS
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Photonis SAS, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Photonis SAS
Publication of EP0479377A1 publication Critical patent/EP0479377A1/de
Application granted granted Critical
Publication of EP0479377B1 publication Critical patent/EP0479377B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

Definitions

  • the present invention relates to a current source having a given ratio between an output current I and an input current i and comprising a first series branch comprising a first resistor in series with the main current path of a first transistor , so as to be traversed by the input current, and a second series branch comprising a second resistor in series with the main current path of a second transistor for delivering the output current, the first and the second transistors being arranged so as to form a first current mirror.
  • the second transistor has an emitter surface G times larger than the first transistor (or it is constituted by G individual transistors identical to the first transistor and arranged in parallel), so as to obtain the same base voltage drop -emitter in the first and second transistors, and avoid thermal drifts of the G ratio.
  • the subject of the present invention is a current source making it possible to obtain in particular, but not exclusively, high ratios between an output current and an input current, without appreciable thermal drift of the ratio G, and by implementing a much simpler circuit than an operational amplifier and also poses no stability problem.
  • a current source according to the invention is thus defined in the characterizing part of claim 1.
  • the compensation circuit easily achievable using the current source technique, makes it possible to compensate for the difference between the emitter-base voltage of the two transistors, which therefore no longer need to be of different dimensions, and this is avoided the complication and the consumption of crystal surface of the integrated circuit, which imposes the implementation of an operational amplifier, from where reduction of the cost.
  • the compensation circuit can comprise a third series branch comprising the main current paths of a third diode-mounted transistor and a fourth transistor, as well as a fourth series branch comprising the main current path of a fifth transistor, the base is connected to that of the third transistor, and a third resistor.
  • the fourth transistor is mounted as a diode.
  • the fourth series branch comprises, between the main current path of the fifth transistor and the third resistor, the main current path of a sixth transistor whose base is connected to the collector of the fourth transistor, whose collector is connected to the base of the fourth transistor, and whose emitter has a surface larger than that of the emitter of the fourth transistor.
  • the third series branch can be arranged to be traversed by a current substantially equal to the input current. This enables the compensation circuit to be supplied without having to specifically produce a current value. As it is easy to choose a compensation current lower than the input current, a supply of the compensation circuit from a current equal to the input current is always sufficient.
  • the first series branch may include a fourth resistor in series with the first resistor, the current compensator then having an input connected to a point common to the first and to the fourth resistor. This provides an additional parameter for determining the compensation.
  • the current source may have an input branch having an input resistance and forming a second current mirror with the first series branch. It is thus possible to produce a buffer interface having a fixed or programmable input impedance and preventing interference from the output to the input of the interface.
  • the invention also relates to a power amplifier, the input resistance being constituted by a divider bridge whose midpoint constitutes the input of the amplifier.
  • an operational amplifier AP has at its non-inverting input a resistor R and a resistor R 'at its output B (emitter of a transistor T mounted as an emitter follower), connected to the inverting input of the AP amplifier.
  • An input current i is injected at the input A and crosses the resistance R.
  • the ratio G is defined with good precision, but on the other hand an operational amplifier requires many components and poses problems of stability and frequency response.
  • a pnp type transistor T1 has its emitter connected to a supply voltage source Vcc through two resistors in series R1 and R2, and its base (point D) to that of a transistor T2 of type pnp whose emitter is connected to the voltage source Vcc through a resistor R3 and whose collector provides an output current I.
  • An npn transistor T10 has its base connected to the collector of transistor T1, its collector at the base of transistors T1 and T2 and its transmitter at the common mode pole (ground).
  • the transistors T1 and T2 form a current mirror in the ratio G between the currents I and i, but with a significant thermal dependence if the two transistors are not in dimension ratios corresponding to the ratio G, that is to say that the emitter of the transistor T2 has an equal effective surface at G times that of the emitter of transistor T1.
  • An input current mirror comprises in series between the voltage source Vcc and the common mode pole a resistor R5 and the main current path of an npn transistor T15 mounted as a diode by base-collector short-circuit.
  • the base of transistor T15 is connected to that of an npn transistor T14 whose main current path is in series between the collector of transistor T1 and ground.
  • the same input current i crosses their main current paths.
  • the common point F at the resistors R1 and R2 is connected to the collector of an npn transistor T5 whose main current path is in series with that of a transistor T6 of the same type and a resistor R4 including one terminal is grounded.
  • the base of the transistor T5 is connected to that of an npn transistor T3 mounted as a diode and whose main current path is in series with that of a transistor T4 whose emitter is grounded.
  • the base of transistor T4 is connected to the collector of transistor T6 and the collector of transistor T4 is connected to the base of transistor T6.
  • the series branch constituted by the transistors T3 and T4 is supplied by a current source of arbitrary intensity, here chosen equal to the input current i to simplify the circuit.
  • the current i0 has the value: is4 and is6 being the current constants characteristic of the transistors respectively T4 and T respectivement.
  • the ratio i s4 / i s6 is equal to the ratio of the effective surfaces of the emitters of T6 and T4 respectively.
  • the compensation by the current i0 is obtained by a simpler circuit than previously, in that the transistor T6 is omitted and that the transistor T4 is mounted as a diode. Compensation is only approximate and a condition is that i0 be very close to i. We then have:
  • FIG. 4 shows a power amplifier implementing a current source as defined above.
  • the resistor R5 is replaced by two resistors in series R'5 and R''5 whose midpoint constitutes the input E of the amplifier. We therefore obtain a voltage gain equal to R1 + R'/ R'' perennialt, and a current gain equal to G.

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)
  • Amplifiers (AREA)
  • Control Of Electrical Variables (AREA)
EP91202505A 1990-10-05 1991-09-26 Stromquelle mit bestimmtem Verhältnis zwischen Eingangs- und Ausgangsströmen Expired - Lifetime EP0479377B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9012307 1990-10-05
FR9012307A FR2667703A1 (fr) 1990-10-05 1990-10-05 Source de courant a rapport donne entre courant de sortie et d'entree.

Publications (2)

Publication Number Publication Date
EP0479377A1 true EP0479377A1 (de) 1992-04-08
EP0479377B1 EP0479377B1 (de) 1996-01-03

Family

ID=9400979

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91202505A Expired - Lifetime EP0479377B1 (de) 1990-10-05 1991-09-26 Stromquelle mit bestimmtem Verhältnis zwischen Eingangs- und Ausgangsströmen

Country Status (5)

Country Link
US (1) US5179357A (de)
EP (1) EP0479377B1 (de)
JP (1) JP3272749B2 (de)
DE (1) DE69116063T2 (de)
FR (1) FR2667703A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0608694A2 (de) * 1993-01-27 1994-08-03 Siemens Aktiengesellschaft Integrierbare Stromquellenschaltung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0539137B1 (de) * 1991-10-21 2000-01-05 Matsushita Electric Industrial Co., Ltd. Verstärker
JP3091801B2 (ja) * 1993-02-09 2000-09-25 松下電器産業株式会社 電流発生装置
US7907012B2 (en) * 2008-10-21 2011-03-15 Analog Devices, Inc. Current mirror with low headroom and linear response

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2325979A1 (fr) * 1975-09-23 1977-04-22 Ates Componenti Elettron Circuit electrique en miroir d'intensite a compensation de temperature
US4354122A (en) * 1980-08-08 1982-10-12 Bell Telephone Laboratories, Incorporated Voltage to current converter

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3886435A (en) * 1973-08-03 1975-05-27 Rca Corp V' be 'voltage voltage source temperature compensation network
US4242650A (en) * 1978-11-13 1980-12-30 Bell Telephone Laboratories, Incorporated Active variable equalizer
JPS607845B2 (ja) * 1979-09-21 1985-02-27 パイオニア株式会社 増幅器
JPS5646314A (en) * 1979-09-21 1981-04-27 Pioneer Electronic Corp Equalizing amplifier
US4350904A (en) * 1980-09-22 1982-09-21 Bell Telephone Laboratories, Incorporated Current source with modified temperature coefficient
JPS59181811A (ja) * 1983-03-31 1984-10-16 Toshiba Corp 可変抵抗回路
US4990803A (en) * 1989-03-27 1991-02-05 Analog Devices, Inc. Logarithmic amplifier

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2325979A1 (fr) * 1975-09-23 1977-04-22 Ates Componenti Elettron Circuit electrique en miroir d'intensite a compensation de temperature
US4354122A (en) * 1980-08-08 1982-10-12 Bell Telephone Laboratories, Incorporated Voltage to current converter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN. vol. 26, no. 3B, Août 1983, NEW YORK US pages 1374 - 1376; D. D. MYRON ET AL.: 'Beta Compensated Current Mirror Cicuit' *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0608694A2 (de) * 1993-01-27 1994-08-03 Siemens Aktiengesellschaft Integrierbare Stromquellenschaltung
EP0608694A3 (de) * 1993-01-27 1994-11-02 Siemens Ag Integrierbare Stromquellenschaltung.

Also Published As

Publication number Publication date
EP0479377B1 (de) 1996-01-03
DE69116063T2 (de) 1996-08-01
FR2667703A1 (fr) 1992-04-10
US5179357A (en) 1993-01-12
DE69116063D1 (de) 1996-02-15
JPH04289905A (ja) 1992-10-14
JP3272749B2 (ja) 2002-04-08

Similar Documents

Publication Publication Date Title
EP0680140B1 (de) Differenzverstärker mit Gleichtaktregelung
FR2623307A1 (fr) Source de courant a deux bornes avec compensation de temperature
FR2804567A1 (fr) Preamplificateur video
EP0587509B1 (de) Spannungs-Strom-Umsetzerschaltungsanordnung
FR2676149A1 (fr) Amplificateur differentiel notamment du type a cascode.
FR2514214A1 (fr) Circuit a gain variable
EP0845856B1 (de) Rauscharmer Transkonduktanzverstärker mit hoher Aussteuerung
EP0649079B1 (de) Geregelter Spannungsquellengenerator der Bandgapbauart
EP0479377B1 (de) Stromquelle mit bestimmtem Verhältnis zwischen Eingangs- und Ausgangsströmen
EP0524294B1 (de) Verstärkerschaltung mit exponentieller verstärkungssteuerung
EP0816965B1 (de) Temperaturabhängig geregelter Referenzspannungsgenerator
EP0533230B1 (de) Differenzverstärker, Oszillator und Mischer
EP0655176B1 (de) Verstärkerstufe mit geringer thermischer verzerrung
FR2881850A1 (fr) Circuit de generation d'une tension de reference flottante, en technologie cmos
FR2677781A1 (fr) Source de courant adaptee a des variations rapides de tension de sortie.
EP0536063B1 (de) Präzisionsstromgenerator
FR2756681A1 (fr) Dephaseur commande en tension
EP0292071A1 (de) Stromspiegel mit hoher Ausgangsspannung
FR2471100A1 (fr) Circuit d'alimentation de ligne telephonique
EP0554193B1 (de) Offsetkompensationsvorrichtung für eine Eingangsstufe
EP0886382A1 (de) Analog-Digital-Wandler
EP0903848A1 (de) Symmetrisch-zu-asymmetrischer Signalwandler
FR2801116A1 (fr) Dispositif generateur de tension corrige a basse temperature
EP0353808A1 (de) Stromausgleichsschaltung
FR2597679A1 (fr) Amplificateur suiveur a grande vitesse.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19921123

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: N.V. PHILIPS' GLOEILAMPENFABRIEKEN

Owner name: PHILIPS COMPOSANTS

17Q First examination report despatched

Effective date: 19940601

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REF Corresponds to:

Ref document number: 69116063

Country of ref document: DE

Date of ref document: 19960215

ITF It: translation for a ep patent filed

Owner name: ING. C. GREGORJ S.P.A.

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19960321

REG Reference to a national code

Ref country code: FR

Ref legal event code: CD

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

REG Reference to a national code

Ref country code: GB

Ref legal event code: 746

Effective date: 20020906

REG Reference to a national code

Ref country code: FR

Ref legal event code: D6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20030926

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20030930

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20031126

Year of fee payment: 13

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040926

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050401

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20040926

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050531

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050926