EP1808818A1 - Procédé destiné à la transmission d'informations et système de transmission du signal, en particulier destiné au contrôle d'accès - Google Patents

Procédé destiné à la transmission d'informations et système de transmission du signal, en particulier destiné au contrôle d'accès Download PDF

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Publication number
EP1808818A1
EP1808818A1 EP06025923A EP06025923A EP1808818A1 EP 1808818 A1 EP1808818 A1 EP 1808818A1 EP 06025923 A EP06025923 A EP 06025923A EP 06025923 A EP06025923 A EP 06025923A EP 1808818 A1 EP1808818 A1 EP 1808818A1
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EP
European Patent Office
Prior art keywords
unit
signal
transmitting
transmitting unit
receiver unit
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.)
Withdrawn
Application number
EP06025923A
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German (de)
English (en)
Inventor
Harald Fischer
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.)
Atmel Germany GmbH
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Atmel Germany GmbH
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Filing date
Publication date
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Publication of EP1808818A1 publication Critical patent/EP1808818A1/fr
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
    • G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
    • G07C2009/00777—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means by induction
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
    • G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
    • G07C2009/00793—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means by Hertzian waves
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C2209/00—Indexing scheme relating to groups G07C9/00 - G07C9/38
    • G07C2209/60—Indexing scheme relating to groups G07C9/00174 - G07C9/00944
    • G07C2209/63—Comprising locating means for detecting the position of the data carrier, i.e. within the vehicle or within a certain distance from the vehicle
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00658—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by passive electrical keys
    • G07C9/00714—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by passive electrical keys with passive electrical components, e.g. resistor, capacitor, inductor

Definitions

  • the present invention relates to a method for transmitting information between a receiver unit and a transmitter unit which is mobile with respect to the receiver unit, wherein the transmitter unit transmits a position-dependent electromagnetic signal with a signal vector to the receiver unit, and wherein the receiver unit transmits the electromagnetic signal to a receiver unit , in particular an arrangement of coils receives.
  • the present invention relates to a signal transmission system for electromagnetic signals and the use of a signal transmission system according to the invention for access control.
  • an electromagnetic signal with an access code for the corresponding motor vehicle to at least one in the Motor vehicle arranged receiver unit with at least one antenna system.
  • an evaluation unit present in the receiver unit in the form of a microcontroller checks the received access code and accordingly enables access to the motor vehicle, for example by unlocking the door closing mechanism.
  • Such systems regularly transmit units with three mutually orthogonal transmitting devices in the form of transmitting coils with each perpendicular to each other oriented coil axes are used, so that there is essentially a ball antenna for the transmitting unit.
  • a suitable evaluation unit can then use a stored EMC image of the vehicle to determine the location / location of the transmission unit with respect to the motor vehicle.
  • RKE and PEG systems Passive Entry Go or Remote Keyless Entry
  • a (passive) transponder is "addressed" by a base station arranged on a device to be controlled, such as a building. and then (in backscatter mode) transmits an access code to the base station. Again, it is necessary in the course of so-called. Forwarding problems, in addition to the transmitted access code and the location of the transmitting unit (the transponder) to control.
  • a so-called ID transmitter has three mutually perpendicular receiving coils in a spatial arrangement, so that an unambiguous determination of a magnetic field at the location of the ID transmitter is possible via an evaluation of each received field portions.
  • the transmission coils continue to be five coils are provided for the signal transmission in the subject of the cited document. It should be regarded as disadvantageous in particular that this is connected in a cost-intensive manner with a relatively high space requirement for the corresponding components.
  • the DE 101 59 604 A1 describes a system with three mutually orthogonal antennas in the receiving unit.
  • the DE 198 45 649 A1 discloses two mutually orthogonal antenna coils in the transmitter modules and the antenna unit of an ID transmitter, ie four coils per transmitter-receiver pair.
  • the invention is based on the object to provide a method for transmitting information between a receiver unit and a receiver unit with respect to the mobile transmitting unit and a signal transmission system for electromagnetic signals, which in cost compared to the prior art way with a smaller number of transmitting and Receiving facilities gets by. In this way, in particular access control systems should be cheaper to implement in the future.
  • the object is achieved on the one hand in the method of the type mentioned in the present invention that by the receiving device of the signal vector with respect under certain conditions of its spatial components is measured and that the receiver unit determines a position of the transmitting unit from the specific components of the signal vector based on a stored value field.
  • location refers to the entirety of the parameters / coordinates needed to describe an arrangement of the transmitting unit in space relative to the receiving unit. each three degrees of freedom for the place and for orientation in space.
  • the position of the transmitting unit with respect to the receiver unit is determined by using a position-dependent electromagnetic signal and by means of a value field stored in the receiver unit, whereby a clear reduction of the transmitting and receiving devices used in the overall system of transmitting and receiving unit, for example, in the form of coils, is achievable.
  • the parameters of the electromagnetic signal stored in the value field can be, for example, its amplitude and / or phase position.
  • an extremely preferred embodiment of the signal transmission system provides that the transmitting unit has only a single transmitting coil for emitting the electromagnetic signal.
  • the receiver unit has a number of fewer than three receiver coils, preferably two receiver coils, for receiving the electromagnetic signal.
  • both the transmitting unit and the receiving unit each have only a single transmitting or receiving coil. Such a configuration is due to the resulting strong directional characteristic associated with the occurrence of an increasing number of "receiving holes", which could preclude their practicality.
  • the value field is stored in the form of a ROM table and that a search in the ROM table provides the location of the transmitting unit . Accordingly, a preferred development of the signal transmission system according to the invention provides that the value field is stored in the form of a ROM table in the memory unit. In this way, the position of the transmitting unit can be determined by means of a simple search in the ROM table without complicated calculations and a correspondingly elaborate design of the evaluation unit.
  • a change in position of the transmitting unit is determined by time-repeated searches in the value field and from the change in position a movement of the transmitting unit, for example a speed. Furthermore, by temporally repeated searches in the value field a position of the transmitting unit can be determined in such cases in which a first determined characteristic of the received electromagnetic signal in the stored value field is not or can be found only in an ambiguous manner.
  • the stored value field for reasons of storage technology, can understandably not contain all possible values of characteristic values of the electromagnetic signal, but rather has a certain "granularity", interpolation and extrapolation techniques and certain blur conditions can be used to determine the position of the transmitting unit in a manner known per se come, in the latter case, a measured characteristic is also assigned to a specific position of the transmitting device, if the measured characteristic does not match one hundred percent exactly with a corresponding stored value.
  • a useful signal such as an access code
  • the evaluation unit is designed to determine a useful signal, such as an access code from the electromagnetic signal.
  • conventional modulation techniques such as ON-OFF keying
  • a control signal for a functional unit such as an access control device, can be triggered as a function of the useful signal and the specific position of the transmitting unit.
  • the signal transmission system can be used for access control, wherein the receiver unit in a device to be controlled, such as a car or a building, and wherein the receiver unit further comprises a control unit, by which, depending on the particular location of the transmitting unit, an access control signal for an access control, eg a door, of the device to be controlled can be triggered.
  • a control unit by which, depending on the particular location of the transmitting unit, an access control signal for an access control, eg a door, of the device to be controlled can be triggered.
  • an access control signal for an access control eg a door
  • the scope of the present invention is not limited to access control.
  • the present invention can also be advantageously used in the area of Tire Pressure Measurement (TPM) or the like.
  • TPM Tire Pressure Measurement
  • FIG. 1 shows an inventive signal transmission system 1 with a mobile transmitting unit 2 and a receiver unit 3.
  • the receiver unit 3 for access control within a device to be controlled 4, for example a motor vehicle, arranged.
  • the transmission unit 2 is designed to transmit electromagnetic signals 5 to the receiver unit 3, as will be described in detail below.
  • the receiver unit 3 has a receiving device 6 for receiving the electromagnetic signal 5 from the transmitting unit 2. Furthermore, the receiver unit 3 has, in operative connection with the receiving device 6, an evaluation unit 7, which is further connected to a memory unit 8, e.g. a mass storage, is in operative connection. In the memory unit 8, a value field 9 is stored with characteristics of the electromagnetic signal 5 in the form of a ROM table. In addition, the evaluation unit 7 is connected to a control unit 10, which in turn communicates with at least one access control element 11 of the device 4 to be monitored, for example a door or the like.
  • a control unit 10 which in turn communicates with at least one access control element 11 of the device 4 to be monitored, for example a door or the like.
  • the transmitting unit 2 transmits an electromagnetic signal 5 dependent on the receiving device 6 in the receiver unit 3, ie the electromagnetic signal 5 received at the location of the receiving device 6 depends on its parameters, such as Amplitude and / or direction of the field vector, from a position of the transmitting unit 2 with respect to the receiving device 6 from.
  • the electromagnetic signal 5 thus received by the receiving device 6 is evaluated by the evaluation unit 7, in which it compares the measured signal with corresponding entries in the value field 9, which is stored in the memory unit 8 of the receiver unit 3. By comparing the received signal 5 with the stored value field 9, the evaluation unit 7 is able to determine where, ie in which position relative to the receiver unit 3, the transmitting unit 2 is located.
  • the evaluation unit 7 can subsequently instruct the control unit 10 to send a specific control signal KS to the access control element 11, for example a control signal for enabling the access control element 11, for example for opening a door or the like.
  • the evaluation unit 7 according to the invention is further configured to identify or evaluate an access code transmitted with the electromagnetic signal 5 and to control the control unit 10 in dependence on the above-mentioned comparison result and the above-described evaluation of the access code.
  • the access control element 11 only if the receiving device 6 has a correct, i. one of the respective to be controlled device 4 associated access code receives from a transmitting unit 2, the latter additionally in a certain position (or a certain layer area) with respect to distance and / or orientation of the device to be controlled 4 must be arranged, for example, so-called forwarding To prevent problems.
  • a correct i. one of the respective to be controlled device 4 associated access code receives from a transmitting unit 2
  • the latter additionally in a certain position (or a certain layer area) with respect to distance and / or orientation of the device to be controlled 4 must be arranged, for example, so-called forwarding To prevent problems.
  • FIG. 2 shows in a more detailed representation the transmitting unit 2 and the receiver unit 3 of the signal transmission system according to the invention according to FIG. 1.
  • the transmitting unit 2 which according to the invention can be designed as an active or passive transmitting unit, has a single coil 2.1 as transmitting means , which is connected in series with a capacitor 2.2.
  • the transmission unit 2 described above is integrated in a motor vehicle key or a transponder.
  • FIG. 2 shows the receiving device 6 of the receiver unit 3 according to FIG. 1 on the basis of a detailed block diagram.
  • the receiving device 6 has two receiver coils 6.1 or 6.2, to each of which a capacitor is connected in parallel 6.3 or 6.4, which is known in the art per se.
  • Each of the two coils 6.1, 6.2 is assigned a controllable amplifier 6.5 or 6.6. Their outputs are connected to a correlator / adder 6.7, which in turn in a conventional manner, a timer unit 6.8, a header detection unit 6.9 and a serial interface 6.10 are connected downstream.
  • the outputs designated by NDATA / NWAKEUP or NSCL of the header detection unit 6.9 or of the serial interface 6.10 are connected to the evaluation unit 7 (FIG. 1), which may be designed, for example, as a microcontroller (for example as an 8-bit AVR).
  • the voltage supply of both the receiving device 6 and the evaluation unit 7 by means of a voltage source 6.11 (supply voltage VDD).
  • the coils 6.1, 6.2 receive the electromagnetic signal 5 emitted by the transmitting unit 2, the signal components received by the respective coils and the composite signal resulting therefrom varying depending on the position due to the inventive design of the transmitting unit 2 with only one transmitting coil 2.1.
  • the respective signal components received by the coils 6.1 and 6.2 are amplified by means of the amplifiers 6.5 and 6.6, whereupon in the correlator / adder 6.7 a signal addition according to magnitude and phase takes place.
  • the total signal thus obtained is then - especially after further processing for detecting header information or the like - as well as the individual received signal components of the evaluation 7 supplied, which is initially formed in a conventional manner to the emitted by the transmitting unit 2 electromagnetic Signal 5 to take an access code, eg by demodulation, which is then usable in the context of the present invention, in particular for the release of the access control element 11.
  • the correlating stage may be designed for at least volatile storage and subsequent provision of such correlated measured values.
  • the transmitting unit 2 In order to avoid so-called forwarding problems as part of an access control, it is furthermore essential for PEG systems to obtain the information obtained via an access code transmitted by the transmitting unit 2 with information regarding a position of the transmitting unit 2 with respect to the receiver unit 3 to link.
  • the additional consideration of such position information is also important in those cases in which the transmitting unit 2 may be located within the device 4 to be monitored, for example within a motor vehicle interior, in which case it must be ensured by a secure position detection, the access to the device 4 to be checked is not blocked for a person as long as the transmitting unit 2, for example the vehicle key, is located within the device to be checked.
  • the receiver coils 6.1, 6.2 with respect to their respective Coil axes A1 and A2 to be arranged such that a spanned by the coil axes A1, A2 plane E, perpendicular to the, ie in a direction parallel to the plane normal vector no reception of electromagnetic signals 5 is possible, as low as possible to an assumed preferred direction of the transmitting unit 2 and the transmitting coil is aligned with coil axis A2 2.1.
  • the coils 6.1, 6.2 or their coil axes A1, A2 are preferably arranged according to the invention such that the normal vector the plane E does not coincide with a presumable preferred direction of the coil axis A3 of the transmitting coil 2.1, wherein the coil axes A1, A2 need not be perpendicular to each other, but in principle may include any angle.
  • the coil axes A1, A2 need not be perpendicular to each other, but in principle may include any angle.
  • a measured pair of components S 1 , S 2 is assigned at least one stored pair of values from a location in the room around the receiving device and from a corresponding S 3 value, so that both of the measured components S 1 , S 2 S 3 value as well as the location or a specific local area can be determined.
  • the problem of ambiguities will be discussed in more detail below.
  • FIG. 4 illustrates the nomenclature used in the context of the present description with regard to the position L i of the transmitting device 2 with respect to the device 4 to be monitored or the receiver unit 3 / receiving device 6 contained therein.
  • FIG. 4 two possible positions L 1 , L 2 of the transmitting unit 2 shown.
  • Each of the layers L 1 , L 2 is first described in terms of space by a coordinate triple (x 1 / y 1 / z 1 ) or (x 2 / y 2 / z 2 ).
  • the individual coordinates x z i the coordinate values with respect to the orthogonal spatial directions shown also in FIG. 4, each x, y and z to be i, y i,.
  • Each of the above-mentioned coordinate triples indicates a location in three-dimensional space around the device 4 to be inspected, at which the transmission unit 2 may be located.
  • the transmitting unit 2 can assume any orientation in space at any location described in this way, which is denoted in FIG. 4 by O 1 , O 2 and a corresponding self-contained arrow. Such an orientation can be indicated, for example, by means of two angles with respect to a reference plane (for example elevation and azimuth angles).
  • the zero point of the coordinate system shown in FIG. 4 is located at the location of the receiving device 6 (see FIG. 1).
  • the respective coordinate triples (x i / y i / z i ) define a (euclidean) distance r of the transmitting unit 2 from the receiver unit 3 / receiving device 6.
  • the transmitter unit 2 will now give a specific waveform for the received electromagnetic signal 5 at the location of the receiver unit 3 / receiving device 6.
  • an infinite number of possible signal profiles corresponding to all possible acceptable orientations O i of the transmitting unit 2 are assigned to each coordinate triple (from an infinite number of coordinate triplets).
  • only a finite number of possible parameters are stored in the value field 9 stored in the memory unit 8 (FIG. 1) for each coordinate triple, as is illustrated symbolically below with reference to FIG.
  • FIG. 5 shows a schematic partial representation of the value field 9 stored in the memory unit 8, which is designed as a multi-layer characteristic field in accordance with the exemplary embodiment shown.
  • the coordinate triples already explained above with reference to FIG. 4 are symbolized by cube-shaped structures in the illustration according to FIG. 5, the number of cubes being determined by the intended accuracy of the (discrete, "grainy") value divisions in the respective spatial direction x, y , z is determined.
  • the "cube" associated with the two layers L 1 and L 2 of FIG. 4 is shown hatched. Each of the cube shown in Fig.
  • each of the cubes shown in Fig. 5 is again divided by a corresponding array of cubes, each of these "sub-cubes" comprising a storage area of the storage unit 8 for storing electromagnetic signal characteristics 5 for a particular (discrete ) Location and a specific (discrete) orientation of the transmitting unit 2 with respect to the receiver unit 3 / receiving device 6 indicates.
  • the evaluation unit 7 of the signal transmission system 1 is designed to access these memory areas and thus by means of a search in the stored value field 9 on the basis of a comparison of the measured characteristics of the electromagnetic signal 5 réellezuschliessen to the position and orientation of the transmitting device.
  • the location (not the orientation) of the transmitting device is regularly required.
  • Certain intermediate values which are not explicitly included in this because of the discrete design of the characteristic map according to FIG. 5, can be found, for example, by the fact that for the mentioned comparison of actual value (measured value) and desired value (stored value) certain "inaccuracy criterion" is defined, so that a certain map value is found even if the measured value within certain limits deviates from it.
  • the position determined in each case for a specific time t i L i is stored in the evaluation unit 7 (FIG. 1). Accordingly, if a plurality of positions of the characteristic field are respectively to be determined for a particular sequence of determined characteristic quantities of the electromagnetic signal 5, according to the invention a corresponding selection can be made based on the assumption that all positions L i determined within a short time interval ⁇ t are shown in FIG Fig. 5 must belong to a single cube or closely spaced cubes of the map. In this way - as I said - ambiguities of the stored map compensate.
  • FIG. 6 shows a flow diagram of a preferred embodiment of the method according to the invention.
  • the method begins with step 600.
  • the transmitting device 2 sends an electromagnetic signal 5 according to FIGS. 1 and 2 to the receiver unit 3.
  • the emission of the electromagnetic signal by the transmitting unit 2 can also be triggered or caused by the receiver unit 3, for example by sending a corresponding signal to the transmitting unit 2, whereupon this is caused to emit the electromagnetic signal 5, for example in the backscatter Operation, wherein, for example, the receiving coils of the receiving device according to FIG. 2 are used as transmitting coils for transmitting the above-mentioned signal to the transmitting unit.
  • the receiver unit 3 or its receiver 6 receives the electromagnetic signal emitted by the transmitter unit 2.
  • the evaluation unit 7 determines a characteristic of the measured electromagnetic signal, for example its amplitude, and then carries out a search in the stored value field 9, attempting to determine a value corresponding to the characteristic in the latter (Step 608). Subsequently, in step 610, a further query is made as to whether a corresponding value or a value deviating from predetermined limits has been found in the stored value field. If this is not the case (n), then the method is continued with step 602. Otherwise (j), the position of the transmitting unit is determined on the basis of the corresponding value field entry, where ambiguities may possibly occur if one and the same parameter is contained in the stored value field several times (step 612).
  • step 614 a query is made as to whether or not the position of the transmission unit determined in this way is unambiguous.
  • the determined position is buffered in the evaluation unit 7 in step 616, and the method returns to step 602 to determine at least one further position of the transmission unit, and then the ambiguity is resolved as described above can.
  • the evaluation unit in step 618 a corresponding signal to the control unit 10 (Fig. 1).
  • the control unit 10 delivers a control signal KS in a subsequent step 620 to the access control 11 shown in FIG. 1, so that this access to the device to be controlled 4 releases.
  • the method ends with step 622.
EP06025923A 2005-12-20 2006-12-14 Procédé destiné à la transmission d'informations et système de transmission du signal, en particulier destiné au contrôle d'accès Withdrawn EP1808818A1 (fr)

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DE102005060914A DE102005060914A1 (de) 2005-12-20 2005-12-20 Verfahren zum Übertragen von Informationen und Signalübertragungssystem, insbesondere zur Zugangskontrolle

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EP1808818A1 true EP1808818A1 (fr) 2007-07-18

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US (1) US20070139171A1 (fr)
EP (1) EP1808818A1 (fr)
DE (1) DE102005060914A1 (fr)

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Publication number Priority date Publication date Assignee Title
WO2007121995A2 (fr) * 2006-04-25 2007-11-01 Atmel Germany Gmbh Procédé et ensemble circuit destinés à mesurer l'intensité de champ et circuit intégré
WO2007121995A3 (fr) * 2006-04-25 2008-01-31 Atmel Germany Gmbh Procédé et ensemble circuit destinés à mesurer l'intensité de champ et circuit intégré
US7796965B2 (en) 2006-04-25 2010-09-14 Atmel Automotive Gmbh Method and circuit arrangement for field strength determination and integrated circuit

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