Receiver circuit

This application relates to a receiver circuit for a near-field communication (NFC) tag or an RFID tag. The receiver circuit connects a receiving antenna 208/210 with an NFC or RFID circuit 206. The receiver circuit not only provides rectification but also protects the NFC / RFID circuit from strong...

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Bibliographische Detailangaben
1. Verfasser:	ANTHONY LAWRENCE MCFARTHING
Format:	Patent
Sprache:	eng
Schlagworte:	CONTROLLING ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY PHYSICS REGULATING SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES TRANSMISSION
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Beschreibung
Zusammenfassung:	This application relates to a receiver circuit for a near-field communication (NFC) tag or an RFID tag. The receiver circuit connects a receiving antenna 208/210 with an NFC or RFID circuit 206. The receiver circuit not only provides rectification but also protects the NFC / RFID circuit from strong electromagnetic fields, as would be encountered during wireless charging of a co-located battery. The receiver circuit includes a first rectifier 216/218 and a second rectifier 224/226, which each receive a signal from the antenna. The drain and source of a depletion mode NMOS transistor switch are connected to the first rectifier and the NFC / RFID circuit respectively. A gate of the transistor switch receives a voltage based on an output of the second rectifier, such that the transistor switch is opened when a level of the signal from the antenna exceeds a predetermined level.