EP0623866B1 - Stromquellenanordnung zur Erzeugung mehrfacher Referenzströme - Google Patents
Stromquellenanordnung zur Erzeugung mehrfacher Referenzströme Download PDFInfo
- Publication number
- EP0623866B1 EP0623866B1 EP94106982A EP94106982A EP0623866B1 EP 0623866 B1 EP0623866 B1 EP 0623866B1 EP 94106982 A EP94106982 A EP 94106982A EP 94106982 A EP94106982 A EP 94106982A EP 0623866 B1 EP0623866 B1 EP 0623866B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transistors
- transistor
- current
- current source
- arrangement according
- 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
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- 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 relates to a current source arrangement in a integrated circuit for generating multiple reference currents for distributed circuit arrangements according to the preamble of claim 1.
- Reference currents are well known, for example from the book Tietze / Schenk: Semiconductor Circuit Technology, Springer-Verlag, 7th edition, 1985, page 356 ff.
- the precision current sources described in the aforementioned literature reference contain an operational amplifier which controls a transistor on the output side, one output terminal of which is connected on the one hand to a reference potential via a resistor and on the other hand to the feedback input of the operational amplifier. There is a reference voltage at the positive input of the operational amplifier. A load is switched on at the free output of the transistor. The output voltage of the operational amplifier adjusts itself so that the voltage across the resistor becomes equal to the reference voltage, so that the output current is precisely defined. In application circuits with multiple identical structures, such as. B.
- a multiple DA converter a previously described precision power source is required several times, which is very expensive.
- multiple structures of this type are therefore supplied with the aid of a current mirror circuit in which a reference current is conducted at a central point into a MOS transistor connected as a diode.
- the reference current is often generated using an external source or a resistor.
- Further transistors of the same type as the MOS transistor connected as a diode are then connected as current sources in the individual circuit arrangements of the multiple structures to the reference potential obtained.
- the arrangement of the current sources with the aid of a reference transistor, which is connected as a diode, and the further transistors assigned to the multiple structures result in a (spatially) distributed current mirror.
- the adaptation (matching) of the multiple structures with regard to the same or comparable properties are poorly defined due to the distributed current mirror and the distributed circuit arrangements and can lead to coupling via the common bias line.
- the invention has for its object a generic Specify current source arrangement with which the adaptation properties distributed circuitry improved and mutual Couplings of the distributed circuit arrangements can be reduced. Furthermore, a use for such an arrangement can be specified.
- the invention has the advantage that by dividing the Reference current with the help of parallel, spatially close to each other arranged transistors, which also in a scheme the adaptation properties are included for the sum of the reference currents (matching) by the local in a limited Area transistors arranged improved become. Furthermore, the distributed circuitry largely decoupled due to interference on one line practically not for another supply line for couple another one of the distributed circuit arrangements can. Thus, with extensive decoupling, the distributed circuitry improved global adaptation properties. Different technology gradients cannot have a strong negative impact.
- Embodiments of the invention are characterized in the subclaims.
- the current source arrangement shown in the figure is e.g. B. supplied by a positive voltage, the terminals VCC are at 5 V, while the reference potential GND is at 0 V lies.
- the clamp VR is connected to an input of a transistor N31 which in connection with a transistor N32 a differential amplifier forms.
- This differential amplifier is from a Power source supplied from transistors P31, P32, N33 and N34.
- the one defined by transistors P31 and P32 Current is generated by the current mirror from N33 and N34 in mirrored the differential amplifier.
- transistors N31 and N32 are transistors P33 and P34 arranged, which also switched as a current mirror are.
- the junction of the output circuits of the transistors N32 and P34 form the output VO of the operational amplifier OA.
- the output VO controls a plurality of parallel ones Transistors in the exemplary embodiment by the transistors N1 to N3 are shown.
- a common output connector each of the transistors has a connection connected to the resistor R, the other connection of which Reference potential GND is.
- the connection point of the transistors N1 to N3 with the resistor R is on the other hand with connected to the control input of transistor N32 and forms the feedback input VF of the operational amplifier OA.
- the control loop works so that the potential VF at Control input of transistor N32 the potential at the terminal VR corresponds to d. that is, the reference voltage across the resistor R. is present. Determine the reference voltage and resistance R. precisely the reference current IB.
- the reference current IB becomes more parallel with the help of the plurality Transistors, in the exemplary embodiment using the Transistors N1 to N3 in three reference currents I1 to I3 divided.
- the reference currents I1 to I3 then serve in turn for supplying distributed circuit arrangements B1 to B3, for reasons of clarity, only those Circuit arrangement B1 are shown in detail. It is course that the circuit arrangements B1 to B3 further circuit parts, e.g. B. SZ, VC2 or VC3, which in turn may also be distributed, downstream can.
- the three transistors N1 to N3 are spatially close together, preferably arranged close together, so that for the Reference currents I1 to I3 the adaptation properties in one locally restricted area are decisive. Possibly Interference affects each of the transistors in same way.
- the well-defined in this way Reference currents become the distributed circuitry, e.g. B. three digital-to-analog converters.
- a triple digital-to-analog converter can with transistors N1 of the same design to N3 three well-defined from the central reference current IB and adapted reference currents I1 to I3 are generated which optimal synchronization of the distributed circuit arrangements guarantee.
- a triple digital-to-analog converter can with transistors N1 of the same design to N3 three well-defined from the central reference current IB and adapted reference currents I1 to I3 are generated which optimal synchronization of the distributed circuit arrangements guarantee.
- Another improvement in the generation of reference currents I1 to I3 provides that from the output VO of the operational amplifier OA, which is the control connections of the reference currents generating transistors N1 to N3 controls transistor TC connected as a capacitor according to reference potential is switched.
- TC has a smoothing function.
- Block B1 Each individual reference current I1 to I3 is in the by him supplied distributed circuitry locally to a power source array fed, such as in the Block B1 is shown, and controls this.
- Blocks B2 and B3 are constructed in the same way as B1.
- the locally in the respective distributed circuit arrangement Realized current source is used in the exemplary embodiment of block B1.
- the power source essentially exists from the transistors P11 and P12 with their Output circuits are connected in series and a cascode level form.
- a connection of the transistor P11 is from of the VCC terminal.
- the connection carrying the potential VB of the transistor N1 is connected to the control input of the Transistor P11 and with an output terminal of the transistor P12 connected.
- P11 is a p-channel transistor that is designed to be comparatively large.
- the transistor P12 has essential the task of connecting the transistor P11 with the transistor P12 from the control input of the Transistor P11 and the associated output terminal largely decouple the transistor P12 and the static Characteristic curve of the current source by increasing the differential To improve output resistance.
- a circuit arrangement SZ is connected downstream of block B1, which, for example, a current cell for a digital-to-analog converter forms.
- the current source is in the embodiment advantageously constructed similarly to the circle B1. To match this the transistors P21 to P23 the transistors P11 up to P13.
- the current source IQ supplying the transistor P23 is z. B. corresponding to the transistors P14, N11 and N12 educated. Unlike the transistor P12, it is an output terminal of transistor P22 with the common connection point the output circuits of two switch transistors S1 and S2 connected.
- S1 and S2 are complementary signals S and SQ controlled. Corresponding lead the output terminals O and OQ of the switch transistors S1 and S2 alternate those flowing through P21 and P22 Electricity.
- the reference current I1 is thus functional via the transistor P12 is fed into transistor P11, which is connected to P21 forms a current mirror.
- the same Structure of block B1 and that shown in Figure 1 downstream current cell SZ, in particular the one executed therein Control loop is achieved that the drain potentials of transistors P11 and P21 are largely the same. Consequently is an optimal synchronization of these two circuit parts achieved.
- block B1 has more Current cells can be connected in the same way, for example for a digital-to-analog converter are provided. This is schematically based on the blocks B2 and B3 downstream blocks VC2 and VC3 shown, which then each have a digital-to-analog converter represent.
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- 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)
- Analogue/Digital Conversion (AREA)
Description
In Anwendungsschaltungen mit mehrfach gleichen Strukturen, wie z. B. einem Mehrfach-DA-Umsetzer ist eine zuvor beschriebene Präzisionsstromquelle entsprechend mehrfach erforderlich, was sehr aufwendig ist. Üblicherweise erfolgt die Stromversorgung derartiger Mehrfachstrukturen deshalb mit Hilfe einer Stromspiegelschaltung, bei der an zentraler Stelle ein Referenzstrom in einen als Diode geschalteten MOS-Transistor geleitet wird. Der Referenzstrom wird häufig mittels einer externen Quelle oder mit Hilfe eines Widerstandes erzeugt. Weitere zu dem als Diode geschalteten MOS-Transistor gleichartige Transistoren werden dann als Stromquellen in den einzelnen Schaltungsanordnungen der Mehrfachstrukturen an das erhaltene Referenzpotential geschaltet. Durch die Anordnung der Stromquellen mit Hilfe eines Referenztransistors, der als Diode geschaltet ist, und der weiteren, den Mehrfachstrukturen zugeordneten Transistoren ergibt sich ein (räumlich) verteilter Stromspiegel. Die Anpassung (matching) der Mehrfachstrukturen im Hinblick auf gleiche oder vergleichbare Eigenschaften sind aufgrund des verteilten Stromspiegels und der verteilten Schaltungsanordnungen schlecht definiert und können zu Verkopplungen über die gemeinsame Vorspannungsleitung führen.
Claims (7)
- Stromquellenanordnung in einer integrierten Schaltung zur Erzeugung mehrfacher Referenzströme für verteilte Schaltungsanordnungen,mit einer Mehrzahl von Transistoren (N1...N3), die räumlich beieinander angeordnet sind und deren Laststrecken parallel geschaltet sind,
dadurch gekennzeichnet, daßein Operationsverstärker(OA) vorgesehen ist, dessen erster Eingang an einem Referenzpotential (VR) anliegt und dessen zweiter Eingang (VF) mit einem Mittelabgriff zwischen der Parallelschaltung der Laststrecken der Transistoren (N1...N3) und einem dazu in Reihe geschalteten Widerstandselement (R) verbunden ist, und daßdadurch ein Bezugsstrom (IB) im Lastkreis der Transistoren (N1...N3) definiert ist,wobei die Transistoren (N1...N3) über einen Ausgang (VO) des Operationsverstärkers (OA) angesteuert werden, wodurch der Bezugsstrom (IB) in eine der Anzahl der Transistoren (N1...N3) entsprechende Anzahl von Referenzströmen (I1...I3) aufgeteilt wird, die jeweils eine der verteilten Schaltungsanordnungen (B1, B2, B3) versorgen. - Anordnung nach Anspruch 1,
dadurch gekennzeichnet,
daß Transistoren (N1...N3) gleich dimensioniert sind. - Anordnung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß parallel zu den Laststrecken der Transistoren (N1...N3) zur Glättung ein kapazitves Element (TC) geschaltet ist. - Anordnung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß in die Laststrecken jedes der Transistoren (N1...N3) eine der verteilten Schaltungsanordnungen (B1, B2, B3) in Reihe geschaltet ist, die jeweils eine durch den jeweiligen Referenzstrom (I1, I2, I3) gesteuerte Stromquellenanordnung (P11, P12; P21, P22) aufweisen. - Anordnung nach Anspruch 4,
dadurch gekennzeichnet,
daß die Stromquellenanordnungen (P11, P12; P21, P22) als Kaskodestufen ausgebildet sind, wobei der ausgangsseitig von jedem der Transistoren (N1...N3) gebildete Referenzstrom (I1, I2, I3) jeweils einen ersten Transistor (P11) der Kaskodestufen steuert, dessen Laststrecke mit der Laststrecke eines zweiten Transistors (P12) derart verbunden ist, und daß zur Regelung des Potentials an einem Mittelabgriff zwischen den Laststrecken des ersten und des zweiten Transistors (P11, P12) ein Regeltransistor (P13) vorgesehen ist. - Anordnung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß jeder der Referenzströme (I1...I3) durch die jeweils zugeordnete verteilte Schaltungsanordnung (B1, B2, B3) gespiegelt wird. - Stromquellenanordnung nach einem der vorhergehenden Ansprüche in einem Mehrfach-Digital-Analog-Umsetzer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4315296A DE4315296C2 (de) | 1993-05-07 | 1993-05-07 | Stromquellenanordnung zum Erzeugen mehrfacher Referenzströme |
| DE4315296 | 1993-05-07 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0623866A2 EP0623866A2 (de) | 1994-11-09 |
| EP0623866A3 EP0623866A3 (de) | 1995-01-11 |
| EP0623866B1 true EP0623866B1 (de) | 2000-03-01 |
Family
ID=6487526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94106982A Expired - Lifetime EP0623866B1 (de) | 1993-05-07 | 1994-05-04 | Stromquellenanordnung zur Erzeugung mehrfacher Referenzströme |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0623866B1 (de) |
| DE (2) | DE4315296C2 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19746950C2 (de) * | 1997-01-31 | 2003-11-06 | Lg Semicon Co Ltd | Digital-Analog-Umsetzer |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4587477A (en) * | 1984-05-18 | 1986-05-06 | Hewlett-Packard Company | Binary scaled current array source for digital to analog converters |
| EP0169388B1 (de) * | 1984-07-16 | 1988-09-28 | Siemens Aktiengesellschaft | Integrierte Konstantstromquelle |
| US4596948A (en) * | 1984-10-17 | 1986-06-24 | Irvine Sensors Corporation | Constant current source for integrated circuits |
| DE3779666D1 (de) * | 1986-02-03 | 1992-07-16 | Siemens Ag | Geschaltete stromquelle. |
| US4961045A (en) * | 1989-10-27 | 1990-10-02 | Motorola, Inc. | Floating output digital to analog converter |
| US5063343A (en) * | 1990-04-05 | 1991-11-05 | Gazelle Microcircuits, Inc. | Current pump structure |
-
1993
- 1993-05-07 DE DE4315296A patent/DE4315296C2/de not_active Expired - Fee Related
-
1994
- 1994-05-04 DE DE59409161T patent/DE59409161D1/de not_active Expired - Lifetime
- 1994-05-04 EP EP94106982A patent/EP0623866B1/de not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE4315296C2 (de) | 2000-03-02 |
| EP0623866A3 (de) | 1995-01-11 |
| DE59409161D1 (de) | 2000-04-06 |
| DE4315296A1 (de) | 1994-11-10 |
| EP0623866A2 (de) | 1994-11-09 |
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