Method and apparatus for checking a circuit
AssigneeGiesecke+Devrient Mobile Security GmbH
InventorsKlaus Finkenzeller, Michael Baldischweiler
Life of this patent
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Abstract
A method for checking a circuit devised for contactless data communication, which comprises an antenna and an electronic component coupled with the antenna, comprises the following steps: generating an alternating magnetic field of a field strength, and arranging the circuit in the alternating field region. Then the electronic circuit is excited by means of an energy pulse. In a further step, an oscillation of the circuit in response to the excitation of the circuit by the energy pulse is captured. The captured oscillation of the circuit is finally evaluated, in particular with regard to a self-resonant frequency of the circuit.
Claims19
A method for checking a circuit devised for contactless data communication, which comprises an antenna and an electronic component coupled with the antenna, comprising the steps of:
- generating an alternating magnetic field for the circuit;
- exciting the circuit by means of an energy pulse,
- capturing an oscillation of the circuit in response to the excitation by the energy pulse;
- and
- evaluating the captured oscillation of the circuit;
- wherein the generating of the alternating magnetic field is effected or temporarily interrupted during the exciting, and
- wherein the evaluating of the captured oscillation is effected in dependence on the field strength of the alternating magnetic field in which the circuit is arranged.
An apparatus for checking a circuit devised for contactless data communication, which comprises an antenna and an electronic component coupled with the antenna, having:
- a transmitting device having a transmitting antenna which is devised to generate an alternating magnetic field for a circuit to be checked which is arrangeable in the measuring apparatus,
- a pulse means which is devised to additionally excite the circuit to be checked, and
- an evaluation means which is devised to evaluate an oscillation of the circuit to be checked which is captured in response to the excitation by the pulse means,
- wherein the apparatus is devised to either temporarily switch off or maintain the alternating magnetic field while the circuit is additionally excited, and
- wherein the evaluation of the captured oscillation is effected in dependence on the field strength of the alternating magnetic field in which the circuit is arranged.
Dependencies are inferred from the claim text.