WO2008031683A1 - Circuit with a controllable signal converter - Google Patents
Circuit with a controllable signal converter Download PDFInfo
- Publication number
- WO2008031683A1 WO2008031683A1 PCT/EP2007/058437 EP2007058437W WO2008031683A1 WO 2008031683 A1 WO2008031683 A1 WO 2008031683A1 EP 2007058437 W EP2007058437 W EP 2007058437W WO 2008031683 A1 WO2008031683 A1 WO 2008031683A1
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- WO
- WIPO (PCT)
- Prior art keywords
- signal
- circuit
- converter
- input signal
- signal converter
- 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.)
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/18—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging
- H03M1/186—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging in feedforward mode, i.e. by determining the range to be selected directly from the input signal
Definitions
- the invention is based on a circuit having an input signal, a signal converter and an output signal, wherein the output signal by means of the
- Signal converter from the input signal can be displayed.
- Micro-electro-mechanical components in particular micromechanical sensors, often consist of a measuring element and an evaluation circuit.
- the evaluation circuit prepares the measured variable received by the measuring element, in which it is transformed, for example, from a capacitance change into a voltage signal, amplified and converted in an analogue-digital manner.
- the evaluation circuit finally outputs a defined output signal.
- the energy requirement of the processing and thus large parts of the evaluation circuit is far greater than the energy required to maintain the function of the measuring element alone.
- the evaluation circuit is always in operation, even if the input variable does not change over time. The energy requirement of the evaluation circuit is thus a determining and avoidable share of the total energy requirements of a sensor that can reduce the duration of operational readiness in battery-powered devices.
- the invention is based on a circuit having an input signal, a signal converter and an output signal, wherein the output signal can be displayed by means of the signal converter from the input signal.
- the essence of the invention is that the circuit has a rating unit, by means of which the signal converter is controllable in dependence on a change of the input signal.
- the operation of the circuit can be adjusted by the input signal according to its requirements.
- Assessment unit is controllable such that when a change in the input signal of the signal converter is turned on or even with a constant input signal of the signal converter is turned off.
- the evaluation unit is only operated when the input signal changes.
- energy for the operation of the circuit can be saved.
- circuit has a clocking.
- this provides a measure of time in which all the essential components of the circuit operate, in particular in which the input signal is evaluated for a change and accordingly the signal converter is influenced.
- the circuit has a memory in which the output signal is storable.
- the last output signal thus formed is always available, even if the signal converter is switched off, for example, or the circuit is in a different state in that no current output signal is currently being formed.
- the output signal stored in the memory always represents a current signal corresponding to the input signal
- An advantageous embodiment provides that the input signal is an analog signal, the output signal is a digital signal and the signal converter is an analog-to-digital converter.
- An advantageous embodiment provides that the input signal, the signal of a micromechanical sensor, in particular a micromechanical sensor with capacitive measuring means, is.
- measured values of micromechanical sensors with such a circuit can be read out in a particularly energy-saving manner.
- Figure 1 shows a first embodiment of a circuit according to the invention with a controllable signal converter
- FIG. 2 shows a second exemplary embodiment of a circuit according to the invention with a controllable signal converter.
- FIG. 1 shows a first exemplary embodiment of a circuit according to the invention with a controllable signal converter. Shown is a circuit having an input signal 10, a rating unit 20, a signal converter 30 and a
- Output signal 40 The input signal 10 is fed to the evaluation unit 20 and evaluated there for a signal change. This assessment may for example be based on a change over time of the input signal 10 itself, or on a change from a reference value. The decision as to whether there is a signal change may be subject to a threshold value 15 for a minimum of a change or else to a tolerance. The threshold 15 may be programmable. It can be set internally or set externally or can be fed.
- the evaluation unit 20 outputs either the signal change YES or the signal change NO in this example. The signal YES or NO is supplied to the signal converter 30. If the signal YES is active, the signal converter 30 is switched on or left in the switched-on state.
- the signal converter 30 is switched off or left in the off state.
- the input signal 10 is supplied directly or indirectly to the signal converter 30. Indirect delivery of the input signal 10 may mean, for example, that the input signal 10 is still amplified or processed in some way. in the - A -
- Signal converter 30 the input signal 10 is converted into an output signal 40.
- This example is an analog-to-digital conversion of the signal. Under conversion can be understood in an alternative embodiment of the invention but also a different kind of signal processing of the input signal 10 to the output signal 40.
- the signal converter 30 is in the on state at an output the
- FIG. 2 shows a second exemplary embodiment of a circuit according to the invention with a controllable signal converter.
- This alternative embodiment of the invention provides that the input signal 10 in parallel signal paths of both the evaluation unit
- the output signal 40 is stored in a memory 50, so that it is also available when the signal converter 30 is in the off state or just for any other reason no output signal 40 provides.
- Embodiment can also be realized in a development of the first embodiment.
- the inventive circuit according to the embodiments described above, but not limited to this, is particularly suitable as part of an evaluation circuit for micromechanical sensors.
- the input signal 10 corresponds to a sensor element near a measuring element. Changes in this sensor signal can be detected and depending on the evaluation or certain parts thereof switched on and off.
- the evaluation circuit is thus operated, for example, only when a signal change has taken place and consumes only then energy.
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
Description
Beschreibung description
Titeltitle
Schaltung mit einem steuerbaren SignalwandlerCircuit with a controllable signal converter
Stand der TechnikState of the art
Die Erfindung geht aus von einer Schaltung mit einem Eingangssignal, einem Signalwandler und einem Ausgangssignal, wobei das Ausgangssignal mittels desThe invention is based on a circuit having an input signal, a signal converter and an output signal, wherein the output signal by means of the
Signalwandlers aus dem Eingangssignal darstellbar ist.Signal converter from the input signal can be displayed.
Mikro-elektro-mechanische Bauelemente (MEMS), insbesondere mikromechanische Sensoren, bestehen oftmals aus einem Meßelement und einer Auswerteschaltung. Die Auswerteschaltung bereitet die vom Meßelement aufgenommene Meßgröße auf, in dem sie beispielsweise aus einer Kapazitätsänderung in ein Spannungssignal umgeformt, verstärkt und analog- digital gewandelt wird. Die Auswerteschaltung gibt schließlich ein definiertes Ausgabesignal aus. In vielen Fällen ist der Energiebedarf der Aufbereitung und damit großer Teile der Auswerteschaltung weit größer, als der Energiebedarf zur Aufrechterhaltung der Funktion des Meßelements allein. Die Auswerteschaltung ist immer in Betrieb, auch wenn sich die Eingangsgröße zeitlich nicht ändert. Der Energiebedarf der Auswerteschaltung ist somit ein bestimmender und vermeidbarer Anteil am Gesamtenergiebedarf eines Sensors, der in batteriebetriebenen Geräten die Dauer der Betriebsbereitschaft reduzieren kann.Micro-electro-mechanical components (MEMS), in particular micromechanical sensors, often consist of a measuring element and an evaluation circuit. The evaluation circuit prepares the measured variable received by the measuring element, in which it is transformed, for example, from a capacitance change into a voltage signal, amplified and converted in an analogue-digital manner. The evaluation circuit finally outputs a defined output signal. In many cases, the energy requirement of the processing and thus large parts of the evaluation circuit is far greater than the energy required to maintain the function of the measuring element alone. The evaluation circuit is always in operation, even if the input variable does not change over time. The energy requirement of the evaluation circuit is thus a determining and avoidable share of the total energy requirements of a sensor that can reduce the duration of operational readiness in battery-powered devices.
Offenbarung der ErfindungDisclosure of the invention
Vorteile der Erfindung Die Erfindung geht aus von einer Schaltung mit einem Eingangssignal, einem Signalwandler und einem Ausgangssignal, wobei das Ausgangssignal mittels des Signalwandlers aus dem Eingangssignal darstellbar ist. Der Kern der Erfindung besteht darin, daß die Schaltung eine Bewertungseinheit aufweist, mittels der in Abhängigkeit von einer Änderung des Eingangssignals der Signalwandler steuerbar ist. Vorteilhaft kann hierdurch die Arbeitsweise der Schaltung durch das Eingangssignal nach dessen Erfordernissen angepaßt werden.Advantages of the invention The invention is based on a circuit having an input signal, a signal converter and an output signal, wherein the output signal can be displayed by means of the signal converter from the input signal. The essence of the invention is that the circuit has a rating unit, by means of which the signal converter is controllable in dependence on a change of the input signal. Advantageously, thereby the operation of the circuit can be adjusted by the input signal according to its requirements.
Eine vorteilhafte Ausgestaltung sieht vor, daß der Signalwandler durch dieAn advantageous embodiment provides that the signal converter by the
Bewertungseinheit derart steuerbar ist, daß bei einer Änderung des Eingangssignals der Signalwandler eingeschaltet wird oder auch bei einem gleichbleibenden Eingangssignal der Signalwandler ausgeschaltet wird. Vorteilhaft wird hierbei die Bewertungseinheit nur betrieben, wenn sich das Eingangssignal ändert. Vorteilhaft kann so, durch einen nur zeitweisen Betrieb der Bewertungseinheit, Energie für den Betrieb der Schaltung gespart werden.Assessment unit is controllable such that when a change in the input signal of the signal converter is turned on or even with a constant input signal of the signal converter is turned off. Advantageously, the evaluation unit is only operated when the input signal changes. Advantageously, by only a temporary operation of the evaluation unit, energy for the operation of the circuit can be saved.
Eine vorteilhafte Ausgestaltung sieht vor, daß die Schaltung eine Taktung aufweist. Vorteilhaft ist hierdurch ein Zeitmaß gegeben, in dem alle wesentlichen Komponenten der Schaltung arbeiten, insbesondere in dem das Eingangssignal auf eine Änderung hin bewertet wird und dementsprechend der Signalwandler beeinflußt wird.An advantageous embodiment provides that the circuit has a clocking. Advantageously, this provides a measure of time in which all the essential components of the circuit operate, in particular in which the input signal is evaluated for a change and accordingly the signal converter is influenced.
Eine vorteilhafte Ausgestaltung sieht vor, daß die Schaltung einen Speicher aufweist, in dem das Ausgangssignal speicherbar ist. Vorteilhaft steht so das letzte gebildete Ausgangssignal jederzeit zur Verfügung, auch wenn der Signalwandler etwa abgeschaltet wird, oder die Schaltung sich in einem sonstigen zustand befindet, indem gerade kein aktuelles Ausgangssignal gebildet ist. Vorteilhaft stellt das in dem Speicher gespeicherte Ausgangssignal auch immer ein aktuelles dem Eingangssignal entsprechendes Signal dar,An advantageous embodiment provides that the circuit has a memory in which the output signal is storable. Advantageously, the last output signal thus formed is always available, even if the signal converter is switched off, for example, or the circuit is in a different state in that no current output signal is currently being formed. Advantageously, the output signal stored in the memory always represents a current signal corresponding to the input signal,
Eine vorteilhafte Ausgestaltung sieht vor, daß das Eingangssignal ein analoges Signal, das Ausgangssignal ein digitales Signal und der Signalwandler ein Analog-Digital- Wandler ist.An advantageous embodiment provides that the input signal is an analog signal, the output signal is a digital signal and the signal converter is an analog-to-digital converter.
Eine vorteilhafte Ausgestaltung sieht vor, daß das Eingangssignal das Signal eines mikromechanischen Sensors, insbesondere eines mikromechanischen Sensors mit kapazitiven Meßmitteln, ist. Vorteilhaft können Meßwerte mikromechanischer Sensoren mit einer derartigen Schaltung besonders energiesparend ausgelesen werden.An advantageous embodiment provides that the input signal, the signal of a micromechanical sensor, in particular a micromechanical sensor with capacitive measuring means, is. Advantageously, measured values of micromechanical sensors with such a circuit can be read out in a particularly energy-saving manner.
Zeichnungdrawing
Figur 1 zeigt ein erstes Ausführungsbeispiel einer erfindungsgemäßen Schaltung mit einem steuerbaren Signalwandler, undFigure 1 shows a first embodiment of a circuit according to the invention with a controllable signal converter, and
Figur 2 zeigt ein zweites Ausführungsbeispiel einer erfindungsgemäßen Schaltung mit einem steuerbaren Signalwandler.FIG. 2 shows a second exemplary embodiment of a circuit according to the invention with a controllable signal converter.
Ausführungsbeispielembodiment
Ausführungsbeispiele der Erfindung sind in den Figuren dargestellt und nachfolgend beschrieben.Embodiments of the invention are illustrated in the figures and described below.
Figur 1 zeigt ein erstes Ausführungsbeispiel einer erfindungsgemäßen Schaltung mit einem steuerbaren Signalwandler. Dargestellt ist eine Schaltung mit einem Eingangssignal 10, einer Bewertungseinheit 20, einem Signalwandler 30 und einemFIG. 1 shows a first exemplary embodiment of a circuit according to the invention with a controllable signal converter. Shown is a circuit having an input signal 10, a rating unit 20, a signal converter 30 and a
Ausgangssignal 40. Das Eingangssignal 10 wird der Bewertungseinheit 20 zugeführt und dort auf eine Signaländerung hin bewertet. Diese Bewertung kann beispielsweise auf einer zeitlichen Änderung des Eingangssignals 10 selbst, oder auf eine Änderung gegenüber einem Referenzwert basieren. Die Entscheidung, ob eine Signaländerung vorliegt, kann mit einem Schwellenwert 15 für ein Mindestmaß einer Änderung oder auch mit einer Toleranz behaftet sein. Der Schwellenwert 15 kann programmierbar sein. Er kann intern gesetzt oder auch von außen gesetzt oder zuführbar sein. Die Bewertungseinheit 20 gibt in diesem Beispiel entweder das Signal Änderung JA oder das Signal Änderung NEIN aus. Das Signal JA oder NEIN wird dem Signalwandler 30 zugeleitet. Ist das Signal JA aktiv, so wird der Signalwandler 30 eingeschaltet bzw. im eingeschalteten Zustand belassen. Ist das Signal NEIN aktiv, so wird der Signalwandler 30 ausgeschaltet bzw. im ausgeschalteten Zustand belassen. Außerdem wird das Eingangssignal 10 mittelbar oder unmittelbar dem Signalwandler 30 zugeführt. Mittelbares Zuführen des Eingangssignals 10 kann beispielsweise bedeuten, daß das Eingangssignal 10 noch verstärkt oder in irgendeiner Art bearbeitet wird. Im - A -Output signal 40. The input signal 10 is fed to the evaluation unit 20 and evaluated there for a signal change. This assessment may for example be based on a change over time of the input signal 10 itself, or on a change from a reference value. The decision as to whether there is a signal change may be subject to a threshold value 15 for a minimum of a change or else to a tolerance. The threshold 15 may be programmable. It can be set internally or set externally or can be fed. The evaluation unit 20 outputs either the signal change YES or the signal change NO in this example. The signal YES or NO is supplied to the signal converter 30. If the signal YES is active, the signal converter 30 is switched on or left in the switched-on state. If the signal NO is active, the signal converter 30 is switched off or left in the off state. In addition, the input signal 10 is supplied directly or indirectly to the signal converter 30. Indirect delivery of the input signal 10 may mean, for example, that the input signal 10 is still amplified or processed in some way. in the - A -
Signalwandler 30 wird das Eingangssignal 10 in ein Ausgangssignal 40 gewandelt. In diesem Beispiel handelt es sich um eine Analog-Digital- Wandlung des Signals. Unter Wandlung kann in alternativer Ausführung der Erfindung aber auch eine anders geartete Signalverarbeitung des Eingangssignals 10 zum Ausgangssignal 40 verstanden werden. Der Signalwandler 30 stellt im eingeschalteten Zustand an einem Ausgang dasSignal converter 30, the input signal 10 is converted into an output signal 40. This example is an analog-to-digital conversion of the signal. Under conversion can be understood in an alternative embodiment of the invention but also a different kind of signal processing of the input signal 10 to the output signal 40. The signal converter 30 is in the on state at an output the
Ausgangssignal 40 bereit.Output signal 40 ready.
Figur 2 zeigt ein zweites Ausführungsbeispiel einer erfindungsgemäßen Schaltung mit einem steuerbaren Signalwandler. Diese alternative Ausgestaltung der Erfindung sieht vor, daß das Eingangssignal 10 in parallelen Signalpfaden sowohl der BewertungseinheitFIG. 2 shows a second exemplary embodiment of a circuit according to the invention with a controllable signal converter. This alternative embodiment of the invention provides that the input signal 10 in parallel signal paths of both the evaluation unit
20 als auch dem Signalwandler 30 direkt zugeleitet wird.20 and the signal converter 30 is supplied directly.
Das Ausgangssignal 40 ist in einem Speicher 50 gespeichert, sodaß es auch dann zur Verfügung steht, wenn der Signalwandler 30 sich im ausgeschalteten Zustand befindet oder aus sonstigen Gründen gerade kein Ausgangssignal 40 bereitstellt. DieseThe output signal 40 is stored in a memory 50, so that it is also available when the signal converter 30 is in the off state or just for any other reason no output signal 40 provides. These
Ausführung läßt sich auch in einer Weiterbildung des ersten Ausführungsbeispiels realisieren.Embodiment can also be realized in a development of the first embodiment.
Die erfϊndungsgemäße Schaltung nach den vorstehend beschriebenen Ausführungsbeispielen, aber nicht auf diese beschränkt, ist besonders als Bestandteil einer Auswerteschaltung für mikromechanische Sensoren geeignet. Das Eingangssignal 10 entspricht hier einem Meßelement nahen Sensorsignal. Änderungen dieses Sensorsignals können erkannt und in Abhängigkeit davon die Auswerteschaltung oder bestimmte Teile davon ein- und ausgeschaltet werden. Die Auswerteschaltung wird somit beispielsweise nur dann betrieben, wenn eine Signaländerung stattgefunden hat und verbraucht auch nur dann Energie. The inventive circuit according to the embodiments described above, but not limited to this, is particularly suitable as part of an evaluation circuit for micromechanical sensors. The input signal 10 corresponds to a sensor element near a measuring element. Changes in this sensor signal can be detected and depending on the evaluation or certain parts thereof switched on and off. The evaluation circuit is thus operated, for example, only when a signal change has taken place and consumes only then energy.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200610043017 DE102006043017A1 (en) | 2006-09-13 | 2006-09-13 | Circuit with a controllable signal converter |
| DE102006043017.4 | 2006-09-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008031683A1 true WO2008031683A1 (en) | 2008-03-20 |
Family
ID=38669870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2007/058437 Ceased WO2008031683A1 (en) | 2006-09-13 | 2007-08-15 | Circuit with a controllable signal converter |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE102006043017A1 (en) |
| WO (1) | WO2008031683A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5710527A (en) * | 1980-06-20 | 1982-01-20 | Toshiba Corp | Time axis restoring system for sampling series by adaptive type sampling system |
| US20030201927A1 (en) * | 2002-04-24 | 2003-10-30 | Takamoto Watanabe | Analog-to-digital conversion method and device |
| DE10314789A1 (en) * | 2003-04-01 | 2004-10-28 | Infineon Technologies Ag | Analogue to digital converter for use in instrumentation, e.g. for use as an air pressure measurement module for a vehicle tire, comprises a capacitive sensor bridge circuit that has a sample and hold capacity |
| US6864817B1 (en) * | 2003-12-30 | 2005-03-08 | Freescale Semiconductor, Inc. | Signaling dependent adaptive analog-to-digital converter (ADC) system and method of using same |
| US20060049972A1 (en) * | 2002-07-31 | 2006-03-09 | Augusto Carlos J R | Asynchronous serial analog-to-digital converter methodology having dynamic adjustment of the bandwidth |
-
2006
- 2006-09-13 DE DE200610043017 patent/DE102006043017A1/en not_active Ceased
-
2007
- 2007-08-15 WO PCT/EP2007/058437 patent/WO2008031683A1/en not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5710527A (en) * | 1980-06-20 | 1982-01-20 | Toshiba Corp | Time axis restoring system for sampling series by adaptive type sampling system |
| US20030201927A1 (en) * | 2002-04-24 | 2003-10-30 | Takamoto Watanabe | Analog-to-digital conversion method and device |
| US20060049972A1 (en) * | 2002-07-31 | 2006-03-09 | Augusto Carlos J R | Asynchronous serial analog-to-digital converter methodology having dynamic adjustment of the bandwidth |
| DE10314789A1 (en) * | 2003-04-01 | 2004-10-28 | Infineon Technologies Ag | Analogue to digital converter for use in instrumentation, e.g. for use as an air pressure measurement module for a vehicle tire, comprises a capacitive sensor bridge circuit that has a sample and hold capacity |
| US6864817B1 (en) * | 2003-12-30 | 2005-03-08 | Freescale Semiconductor, Inc. | Signaling dependent adaptive analog-to-digital converter (ADC) system and method of using same |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102006043017A1 (en) | 2008-03-27 |
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