System and method to test and calibrate card-detection using active tag emulation
First Claim
1. A method for emulating a tag device that communicates via inductive coupling, the method comprising:
- generating, by a transmitter unit of a reader device that communicates via inductive coupling, a transmitted field;
receiving, by a tag emulation device, the transmitted field,wherein the tag emulation device emulates coupling change of the tag emulation device relative to the reader device by changing configuration parameters of the tag emulation device and by not moving the tag emulation device relative to the reader device, wherein changing configuration parameters includes changing a phase of a transmitted signal from the tag emulation device versus a phase of a carrier signal of the transmitted field from the reader device;
detecting, by the reader device, an impedance change of an antenna and matching network system of the reader device,wherein the impedance change corresponds to the emulated coupling change of the tag emulation device relative to the reader device.
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Abstract
This specification discloses methods and devices for emulating a tag device that communicates via inductive coupling, such as a NFC (Near Field Communication) tag device. In some embodiments, this specification discloses methods and devices to use this tag device “emulation” for testing, validating, calibrating, and characterizing a reader device. In some embodiments, a tag emulation device can emulate movement of the tag emulation device relative to the reader device by changing configuration parameters of the tag emulation device and by not actually moving the tag emulation device relative to the reader device. In some embodiments, these configuration parameters changes include: changing a Tx (transmitter) voltage, changing a Tx driver impedance, changing a HF (high frequency) attenuator resistance, changing a Tx output modulation, changing a matching network tuning, changing a phase of a Tx signal versus a carrier signal from the reader device, enabling one or two Tx drivers.
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Citations
20 Claims
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1. A method for emulating a tag device that communicates via inductive coupling, the method comprising:
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generating, by a transmitter unit of a reader device that communicates via inductive coupling, a transmitted field; receiving, by a tag emulation device, the transmitted field, wherein the tag emulation device emulates coupling change of the tag emulation device relative to the reader device by changing configuration parameters of the tag emulation device and by not moving the tag emulation device relative to the reader device, wherein changing configuration parameters includes changing a phase of a transmitted signal from the tag emulation device versus a phase of a carrier signal of the transmitted field from the reader device; detecting, by the reader device, an impedance change of an antenna and matching network system of the reader device, wherein the impedance change corresponds to the emulated coupling change of the tag emulation device relative to the reader device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A tag emulation device that communicates via inductive coupling, the tag emulation device comprising:
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a receiver (Rx) unit, the receiver (Rx) unit configured to receive a transmitted field from a reader device; a matching network, the matching network configured to couple the receiver unit to an antenna; an emulation control unit, the emulation control unit configured to emulate coupling change of the tag emulation device relative to the reader device by changing at least one configuration parameter of the tag emulation device and by not moving the tag emulation device relative to the reader device, wherein the at least one configuration parameter includes changing a phase of a transmitted signal from the tag emulation device versus a phase of a carrier signal of the transmitted field from the reader device, and wherein the emulated coupling change causes an impedance change of an antenna and matching network of the reader device. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification