CARD DETECTION FOR A NFC (NEAR FIELD COMMUNICATION) READER SYSTEM

This specification discloses methods and devices for NFC/RFID (near field communication/radio frequency identification) reader systems to detect an external target device (e.g., tag or card device) within communication distance. In some embodiments, this is achieved by: (i) directing a Tx (transmitt...

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Bibliographische Detailangaben
Hauptverfasser:	HUEBER, Gernot, MACNAMARA, Ian Thomas
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CALCULATING COMPUTING COUNTING ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY HANDLING RECORD CARRIERS PHYSICS PRESENTATION OF DATA RECOGNITION OF DATA RECORD CARRIERS TRANSMISSION
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Beschreibung
Zusammenfassung:	This specification discloses methods and devices for NFC/RFID (near field communication/radio frequency identification) reader systems to detect an external target device (e.g., tag or card device) within communication distance. In some embodiments, this is achieved by: (i) directing a Tx (transmitter) unit to generate a Tx signal, (ii) sweeping through a first Tx output (e.g., Tx voltage) in an increasing manner, and then (iii) monitoring a second Tx output (e.g., Tx current). During monitoring, a step change in the second Tx output (e.g., Tx current) would indicate detection of an external target device.