EP0650112B1 - Konstantstromquelle - Google Patents
Konstantstromquelle Download PDFInfo
- Publication number
- EP0650112B1 EP0650112B1 EP94115731A EP94115731A EP0650112B1 EP 0650112 B1 EP0650112 B1 EP 0650112B1 EP 94115731 A EP94115731 A EP 94115731A EP 94115731 A EP94115731 A EP 94115731A EP 0650112 B1 EP0650112 B1 EP 0650112B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- constant current
- field effect
- source
- effect transistors
- current source
- 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 - Lifetime
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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
- G05F3/24—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 field-effect type only
Definitions
- the invention is based on a constant current source the preamble of claim 1.
- Constant current source For many circuit arrangements, especially in electronics, a constant current source is required. This owns a very high internal resistance, theoretically should be infinite. A realization of one Constant current source is with the help of semiconductor devices possible, e.g. as a so-called current mirror circuit, e.g. from Meinke, Gundlach: Taschenbuch der Hochfrequenztechnik, 4th edition (1986), pp. M22-M23.
- the invention has for its object a generic Specify constant current source using at least a field effect transistor in integrated technology can be produced.
- a first advantage of the invention is that in technically simple and inexpensive way a predeterminable Constant current is adjustable.
- a second advantage is that the set Constant current is almost independent of the manufacturing process of the field effect transistors and hence their electrical properties.
- a third advantage is that the set one Constant current is almost independent of temperature-dependent electrical properties of the field effect transistors.
- a fourth advantage is that only one Type of field effect transistor is necessary.
- a fifth advantage is that in addition to the two field effect transistors only ohmic resistors are needed, which are integrated in a cost-effective manner Technology can be produced.
- a sixth advantage is that the following described circuit arrangement in a reliable and inexpensive Way in GaAs technology integrated circuits e.g. High-frequency circuits, can be integrated is.
- the figure shows two n-channel JFETs A1, A2, which are produced on a semiconductor substrate in the same manufacturing process. Both JFETs A1, A2 have essentially the same pinch-off voltage U p and essentially the same saturation current I DSS .
- the latter is chosen to be substantially larger than the constant current I const to be set , for example I DSS > 5 ⁇ I const .
- the voltage source for example a 7 volt voltage source, one pole (+) is connected to the (circuit) ground M, so that a negative voltage source arises.
- the second JFET A2 is connected as a current source.
- its drain D2 is connected to ground M
- gate G2 and source S2 are connected to one another and connected to a connection of the resistor network R4 to R6, the other connection of which is connected to the minus pole (-) of the voltage source Sp.
- the ohmic resistor network R4 to R6 consists of a series connection of the ohmic resistors R4, R5, which are bridged by the ohmic resistor R6. If the drain current I D2 now flows through this resistance network, a control voltage U GS is generated at the resistor R5 which is dependent on the latter and the drain current I D2 and by means of which the constant current I const flowing through the first JFET A1 can be set.
- the gate G1 of the first JFET A1 is connected to the minus pole (-), to which there is also a connection of the resistor R5.
- Source S1 is at the other terminal of resistor R5.
- Drain D1 is connected to a terminal P1 to which a circuit arrangement through which the constant current I const is to flow can be connected.
- a circuit arrangement through which the constant current I const is to flow can be connected.
- a related source S1 negative voltage U GS at the gate G1 which optimally controls JFET A1.
- the second JFET A2 therefore always measures the current saturation current I DSS , which depends in particular on the production process and the current temperature, and in particular is converted by the resistor R5 into a voltage U GS controlling the first JFET A1. It can be seen that the desired constant current I const is adjustable by changing the resistance R5 in particular.
- the constant current I const remains essentially unchanged with unchanged resistance values of the resistors R4 to R6, even if the pinch-off voltage U p and the saturation current I DSS change within a wide range, for example -1.4 V ⁇ U p ⁇ -1 V; 6m A ⁇ I DSS ⁇ 8.5 mA.
- resistor network R4 to R6 can therefore be calculated as a function of the desired constant current I const .
- the resistors R4 to R6 can therefore be manufactured, for example, in an integrated form without subsequent adjustment.
- Such large tolerance ranges occur in particular of GaAs technology, especially for high and / or High frequency circuits, e.g. so-called millimeter wave circuits.
- the circuit arrangement described is can be produced in MESFET technology for GaAs technology, so that advantageously an integration in monolithic and / or built-in hybrid integrated high-frequency components is possible. With the arrangement described is for example a level converter circuit producible in the submitted on the same day German patent application P .. .. ... (internal file number: UL 93 / 39b) is described in more detail.
- the invention is not limited to the exemplary embodiment described, but can be applied analogously to others.
- the resistors R4, R5 can be designed as a potentiometer, the center tap of which is connected to the source S1 of the first JFET A1. In this way, the constant current I const can be set continuously within predefinable limits.
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)
- Amplifiers (AREA)
- Junction Field-Effect Transistors (AREA)
Description
Claims (7)
- Konstantstromquelle mit einstellbarem Konstantstrom, der mit Hilfe mindestens einem Halbleiterbauelement erzeugt wird, dadurch gekennzeichnet,daß eine Spannungsteilerschaltung vorhanden ist, bestehend aus einer Reihenschaltung aus einem als Stromquelle geschaltetem zweiten Feldeffekt-Transistor (A2), mit den Anschlüssen Source (S2), Drain (D2) sowie Gate (G2), wobei Drain (D2) an einen Pol (M) einer Spannungsquelle (Sp) angeschlossen ist, Source (S2) und Gate (G2) verbunden sind, und mindestens einem einstellbarem ohmschen Widerstand (R4 bis R6), dessen ein Anschluß mit Source (S2) und dessen anderer Anschluß mit dem anderen Pol (-) der Spannungsquelle (Sp) verbunden ist,daß ein erster Feldeffekt-Transistor (A1) vorhanden ist,dessen Gate (G1) mit dem anderen Pol (-) der Spannungsquelle (Sp) verbunden ist,dessen Source (S1) an den Widerstand (R4 bis R6) angeschlossen ist derart, daß zwischen Gate (G1) und Source (S1) ein Widerstand (R5) vorhanden ist, der in Abhängigkeit von dem einzustellenden Konstantstrom (Ikonst), der über Drain (D1) fließt, gewählt ist,dessen Drain (D1) an ein Bauelement anschließbar ist, das für den Konstantstrom (Ikonst) bestimmt ist,daß bei beiden Sperrschicht-Feldeffekt-Transistoren (A1, A2) sich der Sättigungsstrom (IDSS) proportional zur Abschnürspannung (Up) verhält unddaß beide Feldeffekt-Transistoren (A1, A2) ein gleiches elektrisches Verhalten besitzen.
- Konstantstromquelle nach Anspruch 1, dadurch gekennzeichnet, daß der einstellbare Widerstand (R4 bis R6) aus einer Reihenschaltung zweier Widerstände (R4, R5) besteht, zu welcher der Widerstand (R6) parallel geschaltet ist.
- Konstantstromquelle nach Anspruch 1 oder Anspruch 2, daß beide Feldeffekt-Transistoren (A1, A2) einen Sättigungsstrom (IDSS) besitzen, der wesentlich größer als der einzustellende maximale Konstantstrom (Ikonst) ist.
- Konstantstromquelle nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Feldeffekttransistoren (A1, A2) als integrierte Transistoren ausgebildet sind.
- Konstantstromquelle nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Feldeffekt-Transistoren als Sperrschicht-Feldeffekt-Transistoren ausgeführt sind.
- Konstantstromquelle nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zumindest die Sperrschicht-Feldeffekt-Transistoren (A1, A2) mittels GaAs-Technologie hergestellt sind.
- Konstantstromquelle nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zumindest die Sperrschicht-Feldeffekt-Transistoren (A1, A2) mittels der MESFET-Technologie hergestellt sind.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4335683 | 1993-10-20 | ||
DE4335683A DE4335683A1 (de) | 1993-10-20 | 1993-10-20 | Konstantstromquelle |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0650112A2 EP0650112A2 (de) | 1995-04-26 |
EP0650112A3 EP0650112A3 (de) | 1995-08-30 |
EP0650112B1 true EP0650112B1 (de) | 1998-08-05 |
Family
ID=6500532
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94115731A Expired - Lifetime EP0650112B1 (de) | 1993-10-20 | 1994-10-06 | Konstantstromquelle |
Country Status (4)
Country | Link |
---|---|
US (1) | US5488328A (de) |
EP (1) | EP0650112B1 (de) |
DE (2) | DE4335683A1 (de) |
ES (1) | ES2121595T3 (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4335684A1 (de) * | 1993-10-20 | 1995-04-27 | Deutsche Aerospace | Treiberschaltung zur Erzeugung einer Schaltspannung |
EP0748047A1 (de) * | 1995-04-05 | 1996-12-11 | Siemens Aktiengesellschaft | Integrierte Pufferschaltung |
US5903177A (en) * | 1996-09-05 | 1999-05-11 | The Whitaker Corporation | Compensation network for pinch off voltage sensitive circuits |
US5864230A (en) * | 1997-06-30 | 1999-01-26 | Lsi Logic Corporation | Variation-compensated bias current generator |
US5977813A (en) * | 1997-10-03 | 1999-11-02 | International Business Machines Corporation | Temperature monitor/compensation circuit for integrated circuits |
JP3629939B2 (ja) * | 1998-03-18 | 2005-03-16 | セイコーエプソン株式会社 | トランジスタ回路、表示パネル及び電子機器 |
DE19830356C1 (de) * | 1998-07-07 | 1999-11-11 | Siemens Ag | Verfahren zum Abgleichen eines Widerstands in einer integrierten Schaltung und Vorrichtung zur Durchführung dieses Verfahrens |
US6046579A (en) * | 1999-01-11 | 2000-04-04 | National Semiconductor Corporation | Current processing circuit having reduced charge and discharge time constant errors caused by variations in operating temperature and voltage while conveying charge and discharge currents to and from a capacitor |
DE19940382A1 (de) | 1999-08-25 | 2001-03-08 | Infineon Technologies Ag | Stromquelle für niedrige Betriebsspannungen mit hohem Ausgangswiderstand |
US7333156B2 (en) * | 1999-08-26 | 2008-02-19 | Canadian Space Agency | Sequential colour visual telepresence system |
GB0811483D0 (en) * | 2008-06-23 | 2008-07-30 | Xipower Ltd | Improvements in and relating to self oscillating flyback circuits |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU1061124A1 (ru) * | 1982-01-25 | 1983-12-15 | Osipov Yurij V | Стабилизатор посто нного тока |
JPH0640290B2 (ja) * | 1985-03-04 | 1994-05-25 | 株式会社日立製作所 | 安定化電流源回路 |
US4716356A (en) * | 1986-12-19 | 1987-12-29 | Motorola, Inc. | JFET pinch off voltage proportional reference current generating circuit |
US4760284A (en) * | 1987-01-12 | 1988-07-26 | Triquint Semiconductor, Inc. | Pinchoff voltage generator |
GB2211322A (en) * | 1987-12-15 | 1989-06-28 | Gazelle Microcircuits Inc | Circuit for generating reference voltage and reference current |
US4868416A (en) * | 1987-12-15 | 1989-09-19 | Gazelle Microcircuits, Inc. | FET constant reference voltage generator |
JP2753266B2 (ja) * | 1988-06-20 | 1998-05-18 | 株式会社日立製作所 | 半導体回路 |
US4820968A (en) * | 1988-07-27 | 1989-04-11 | Harris Corporation | Compensated current sensing circuit |
US5065043A (en) * | 1990-03-09 | 1991-11-12 | Texas Instruments Incorporated | Biasing circuits for field effect transistors using GaAs FETS |
-
1993
- 1993-10-20 DE DE4335683A patent/DE4335683A1/de not_active Withdrawn
-
1994
- 1994-10-06 EP EP94115731A patent/EP0650112B1/de not_active Expired - Lifetime
- 1994-10-06 DE DE59406607T patent/DE59406607D1/de not_active Expired - Fee Related
- 1994-10-06 ES ES94115731T patent/ES2121595T3/es not_active Expired - Lifetime
- 1994-10-20 US US08/326,497 patent/US5488328A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US5488328A (en) | 1996-01-30 |
DE4335683A1 (de) | 1995-04-27 |
DE59406607D1 (de) | 1998-09-10 |
ES2121595T3 (es) | 1998-12-01 |
EP0650112A3 (de) | 1995-08-30 |
EP0650112A2 (de) | 1995-04-26 |
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