EP0971279A1 - Verfahren zum Abgleichen eines Widerstandes in einer integrierten Schaltung und Vorrichtung zur Durchführung dieses Verfahrens - Google Patents
Verfahren zum Abgleichen eines Widerstandes in einer integrierten Schaltung und Vorrichtung zur Durchführung dieses Verfahrens Download PDFInfo
- Publication number
- EP0971279A1 EP0971279A1 EP99113054A EP99113054A EP0971279A1 EP 0971279 A1 EP0971279 A1 EP 0971279A1 EP 99113054 A EP99113054 A EP 99113054A EP 99113054 A EP99113054 A EP 99113054A EP 0971279 A1 EP0971279 A1 EP 0971279A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- resistor
- switch
- integrated circuit
- voltage
- value
- 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
Links
- 238000000034 method Methods 0.000 title claims description 25
- 230000005669 field effect Effects 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 4
- 238000009966 trimming Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Classifications
-
- 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
- G05F1/575—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 characterised by the feedback circuit
Definitions
- the invention relates to a method for adjusting a resistance in an integrated circuit according to the generic term of claim 1.
- the invention also relates to a device to carry out this procedure.
- Resistors in integrated circuits usually have a tolerance range of up to ⁇ 30% of their nominal value. More precise resistance values So far, only in complex adjustment procedures using laser incisions be reached in the resistance area. The disadvantage of this method is that such resistors are temperature-dependent due to the material.
- DE 19520735 A1 describes a circuit arrangement for detection the load current of a power semiconductor component is known, which is a series connection of a measuring resistor connected to ground and a controllable resistor that is set so that the measuring current is proportional to the load current becomes.
- DE 4101492 A1 describes a circuit arrangement for detection of flowing through a consumer and an output stage Load current known, in which in one with the load circuit connected circuit branch by means of a controllable Resistance whose current is controlled so that this on a resistor a voltage proportional to the load current generated.
- the present invention is therefore based on the object specify a method that is capable of providing resistance in an integrated circuit to much tighter Adjust tolerance values and its temperature dependency to eliminate.
- the object of the invention is also a To provide an apparatus for performing this method.
- the inventive method has the advantage that for comparison of resistance only one at the resistance to be adjusted falling actual voltage by means of an external control circuit a predetermined target voltage is to be adjusted.
- Another advantage of the method according to the invention is that in this way balanced resistors independent of temperature are because the adjustment process shortly before using the Resistance takes place at the respective temperature. With the method according to the invention has tolerance values around the Target value of up to approx. ⁇ 4% can be achieved.
- Figure 1 shows an integrated in a not shown Circuit IS arranged field effect transistor M1, the Drain-source path as a controllable resistor in series with a resistor R1 is also integrated.
- the source connection of the field effect transistor M1 is in this Embodiment with the ground connection GND of the circuit IS connected.
- a capacitor C1 is arranged between the gate terminal G of the field effect transistor M1 and the ground terminal GND.
- the gate connection G is connected via a (on-off) switch S2 and a first changeover switch S1 in series with it, either via a charging resistor R3 to a voltage source V1 or via a discharging resistor R2 to the ground connection GND.
- the charging and discharging of the capacitor C1 can, however, also take place in another way, for example via charging and discharging current sources.
- the first changeover switch S1 is controlled by the output signal V OP of an operational amplifier OP connected as a comparator, the inverting input "-" of which is a predetermined reference voltage V ref , as explained below.
- the resistor RM (in this exemplary embodiment, therefore, R1, which, however, can also lie between the source connection and ground reference potential GND) is connected to the non-inverting input "+" of the operational amplifier OP and via a second switch S3 in the position shown with a reference current source I ref , and in the other position with the integrated circuit IS, not shown, in which the trimmed resistor RM is to be used.
- the first changeover switch S1 is brought into the position shown, whereby the capacitor C1 is charged by the voltage source V1 via the charging resistor R3. This reduces the resistance of the drain-source path of the field effect transistor M1 and thus the voltage V RM .
- the first changeover switch S1 is brought into the other position by the output signal V OP of the operational amplifier OP, as a result of which the capacitor C1 is discharged via the discharge resistor R2.
- the resistance across the drain-source path of the field effect transistor M1 increases again.
- the actual value of the voltage V RM then oscillates around the predetermined setpoint of the reference voltage V ref .
- the components OP, V1, C1, S1, R2 and R3 therefore represent a two-point controller.
- the resistance RM has reached its target value of approximately RM ⁇ 4%.
- Tightly tolerated resistance values can be done in the same way can also be generated without an integrated resistor R1 by only the drain-source path of the field effect transistor M1 serves as a resistance value RM.
- the control circuit including the reference current source I ref is switched off, ie switch S2 is opened (by a command from the integrated circuit IS or from outside) and the second switch is switched to its other position.
- the resistor RM is connected to the integrated circuit IS and the gate voltage V G for a certain period, which depends on the quality of the capacitor C1, frozen ".
- the resistance RM remains constant for a certain time and can be refreshed by repeated trimming processes.
- the inventive method enables in a simple way, integrated resistors dynamically in the Match operation. Expensive and time-consuming test steps for subsequent laser trimming of the resistor omitted. In addition, the temperature response of the integrated Resistance dynamically compared.
- FIG. 2 shows the course of the gate voltage over time during the adjustment process and thereafter and FIG. 3 shows the size of the resistance RM as a quotient V RM / I M over time, likewise during the adjustment process and afterwards.
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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)
- Semiconductor Integrated Circuits (AREA)
- Amplifiers (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
Description
Claims (7)
- Verfahren zum Abgleichen eines Widerstandes (RM) in einer integrierten Schaltung (IS), insbesondere in einem ASIC, welcher eine Reihenschaltung eines Widerstandes (R1) und eines steuerbaren Widerstandes (M1) enthält,
dadurch gekennzeichnet,daß dem abzugleichenden Widerstand (RM) ein Konstantstrom (IM) vorgegebener Stärke eingeprägt wird,daß der Istwert der durch den Konstantstrom (IM) am abzugleichenden Widerstand (RM) verursachten Spannung (VRM) mit einer als Sollwert vorgegebenen Referenzspannung (Vref) verglichen wird, unddaß der steuerbare Widerstand (M1) solange verändert wird, bis der Istwert der am Widerstand (RM) abfallenden Spannung (VRM) mit dem Sollwert der Referenzspannung (Vref) übereinstimmt. - Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Wert des Widerstandes (RM) durch wiederholte Abgleichvorgänge aufgefrischt wird.
- Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, bei welcher der abzugleichende Widerstand (RM) auf der einen Seite mit dem Masseanschluß (GND) der integrierten Schaltung verbunden ist,
dadurch gekennzeichnet,daß der abzugleichende Widerstand (RM) auf der anderen Seite einerseits mit dem nichtinvertierenden Eingang (+) eines als Komparator geschalteten Operationsverstärkers (OP) und andererseits über einen zweiten Umschalter (S3) entweder mit einer Referenzstromquelle (Iref) oder mit der integrierten Schaltung (IS) verbunden ist,daß zwischen dem Steueranschluß (G) des steuerbaren Widerstandes (M1) und dem Masseanschluß (GND) ein Kondensator (C1) angeordnet ist,daß der Steueranschluß (G) über einen Schalter (S2) und einen mit ihm in Reihe liegenden ersten Umschalter (S1) entweder über einen Ladewiderstand (R3) mit einer Spannungsquelle (V1) oder über einen Entladewiderstand (R2) mit dem Masseanschluß(GND) verbunden ist, unddaß der erste Umschalter (S1) vom Ausgangssignal (VOP) des Operationsverstärkers (OP) angesteuert wird, dessen invertierendem Eingang (-) eine vorgegebene Referenzspannung (Vref) zugeführt wird. - Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der steuerbare Widerstand (M1) ein Feldeffekttransistor ist.
- Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß nach erfolgten Abgleichder Widerstand (RM) über den zweiten Umschalter (S3) mit der integrierten Schaltung (IS) verbunden wird, undSchalter (S2) geöffnet wird.
- Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die Ansteuerung des Schalters (S2) und des zweiten Umschalters (S3) von der integrierten Schaltung (IS) oder von außerhalb derselben erfolgt.
- Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Spannungsquelle (V1) und der Ladewiderstand (R3) durch eine den Kondensator (C1) ladende Stromquelle und der Entladewiderstand (R2) durch eine den Kondensator (C1) entladende Stromquelle gebildet sind.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1998130356 DE19830356C1 (de) | 1998-07-07 | 1998-07-07 | Verfahren zum Abgleichen eines Widerstands in einer integrierten Schaltung und Vorrichtung zur Durchführung dieses Verfahrens |
| DE19830356 | 1998-07-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0971279A1 true EP0971279A1 (de) | 2000-01-12 |
| EP0971279B1 EP0971279B1 (de) | 2003-09-24 |
Family
ID=7873246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19990113054 Expired - Lifetime EP0971279B1 (de) | 1998-07-07 | 1999-07-01 | Verfahren zum Abgleichen eines Widerstandes in einer integrierten Schaltung und Vorrichtung zur Durchführung dieses Verfahrens |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0971279B1 (de) |
| DE (1) | DE19830356C1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7888952B2 (en) | 2007-11-16 | 2011-02-15 | Atmel Automotive Gmbh | Circuit arrangement for balancing a resistance circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0499921A2 (de) * | 1991-02-18 | 1992-08-26 | STMicroelectronics S.r.l. | Stromregelungseinrichtung, insbesondere für Leistungsschaltungen in MOS-Technologie |
| US5488328A (en) * | 1993-10-20 | 1996-01-30 | Deutsche Aerospace Ag | Constant current source |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4101452C2 (de) * | 1991-01-16 | 1994-06-09 | Gerd Schulte | Mehrfach-Diaprojektor |
| DE19520735C2 (de) * | 1995-06-07 | 1999-07-01 | Siemens Ag | Schaltungsanordnung zum Erfassen des Laststroms eines Leistungs-Halbleiterbauelementes mit sourceseitiger Last |
-
1998
- 1998-07-07 DE DE1998130356 patent/DE19830356C1/de not_active Expired - Fee Related
-
1999
- 1999-07-01 EP EP19990113054 patent/EP0971279B1/de not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0499921A2 (de) * | 1991-02-18 | 1992-08-26 | STMicroelectronics S.r.l. | Stromregelungseinrichtung, insbesondere für Leistungsschaltungen in MOS-Technologie |
| US5488328A (en) * | 1993-10-20 | 1996-01-30 | Deutsche Aerospace Ag | Constant current source |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7888952B2 (en) | 2007-11-16 | 2011-02-15 | Atmel Automotive Gmbh | Circuit arrangement for balancing a resistance circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0971279B1 (de) | 2003-09-24 |
| DE19830356C1 (de) | 1999-11-11 |
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